Americans' heads have been growing, scientists say
June 5th, 2012
02:43 PM ET

Americans' heads have been growing, scientists say

If you're American with an average-sized head, your noggin is likely bigger than your ancestor's was seven generations ago.

That's the implication of research by Richard Jantz and colleagues at the Forensic Anthropology Center at the University of Tennessee.

The scientists analyzed about 1,500 skulls, dated from various years in the 1800s and 1900s. The researchers focused on Caucasian individuals because there weren't as many skulls from blacks and Hispanics. Although their conclusions are about white Americans, there is no reason to believe these patterns don't pertain to other races, Jantz said. More research just needs to be done.

Over the last 150 years or so, it appears that skulls got narrower from side to side by about 5 to 7 millimeters, and higher from top to bottom by an average of nearly 10 millimeters, Jantz said. And the overall size of the head has, on average, increased by an amount equivalent to the size of a tennis ball, he said.

Jantz speculates that there are several factors in the American environment that help contribute to this trend:

For one, there is far more nutrition than ever before in the United States. The problem of obesity - of over-nutrition - is more of a concern than undernourishment. People's work has become less physically-intensive, and even manual labor is often assisted by machines in some way.

Because of cars, people walk less. Because of vaccines, epidemic diseases that once killed many children no longer do.

Mothers who might not have survived childbirth two centuries ago are now living, thanks to medicines and procedures such as Caesarean sections - their children are surviving, too. And people don't often choose mates with the very same ethnicity – particularly not from the same part of Europe as their own ancestors – as they would have before.

"That has resulted in opening up the gene pool," Jantz said.

Brain size is probably correlated with skull size, so this means Americans' brains may also be getting bigger, but this has yet to be proven. The next step for researchers would be to see if certain parts of the brain have expanded, which might give an indication of whether there are particular abilities that have been enhanced as a result of this change over time.

The researchers did not directly measure the circumference of the head, so it's hard to say whether this trend has had any effect on hat size.

Is the increase in skull size part of a larger pattern of the human body growing in general? It's true that people are on average taller today than in the 1800s, but height has plateaued. What about our heads?

"I think the skulls will continue to change, and I think the direction depends on the direction the environment goes," Jantz said. "Obviously there have to be limits on how narrow or on how tall it could get, so I don't know if I want to predict how much longer this trend will continue."

The researchers hope to get this research published. They presented their findings at the American Association of Physical Anthropologists meeting in April.

soundoff (340 Responses)
  1. Think

    Evolution in action, very cool

    June 5, 2012 at 15:22 | Report abuse | Reply
    • Chief Little Skull

      Nope. Just healthier living conditions. You'll notice the article didn't mention anything about evolution. (And yes I do believe in evolution.)

      June 5, 2012 at 16:35 | Report abuse |
    • ahorseinasuit

      @Chief Little Skull...but that is evolution. Environmental changes are one of the factors of what fuels the whole game. Natural selection is the mechanism. The genetic mutations you're thinking of are only one part of the equation. Given enough time...these little changes (like a change in diet and breeding habits) can become bigger changes. That is something worth getting excited over...even if it means another 100,000 years 😉

      June 5, 2012 at 20:10 | Report abuse |
    • Fig1024

      Just the simple fact of a child not looking exactly like either of the parents is proof evolution exists

      June 5, 2012 at 20:25 | Report abuse |
    • Nah

      fig: "Just the simple fact of a child not looking exactly like either of the parents is proof evolution exists"

      That isn't evolution *facepalm*

      June 5, 2012 at 20:36 | Report abuse |
    • Mike

      Great – "fathead" is now a complement.

      June 5, 2012 at 20:56 | Report abuse |
    • Mike

      Great – "fathead" is now a compliment.

      June 5, 2012 at 20:57 | Report abuse |
    • Guest

      Our heads are getting fatter so they can catch up to the size of our &sses

      June 5, 2012 at 21:32 | Report abuse |
    • Guest

      Evolution takes place over thousands of years
      If you have a kid that doesnt look like you your wife is a wh0re

      June 5, 2012 at 21:34 | Report abuse |
    • Darwin

      @Chief Little Skull..............you may believe in evolution, but you sure don't understand it.

      June 5, 2012 at 22:13 | Report abuse |
    • dan_aykroyd

      This thread made me lulz

      June 5, 2012 at 22:25 | Report abuse |
    • bjim

      I thought that DNA had to change and mutate and become incorporated into the larger gene pool for evolution to take place. Our skulls have become larger across the gene pool with no common change of DNA.

      June 5, 2012 at 22:31 | Report abuse |
    • dan_aykroyd

      Thats a very simplistic definition of macro-evolution.. however what you're missing is that macro-evolution is the sum of smaller changes due to micro-evolution, which is technically what we are seeing here. Many many iterations of micro-evolution must take place independent from another population for their genes to become incompatible. So for now theres chance your offspring might have a bigger head than you, until they mate with each other on an island millions of years while we continue to mate with each other. Then we *might* be two different species.

      June 6, 2012 at 01:35 | Report abuse |
  2. Smoky

    Go Vols! BTW, if you go to a football game at Neyland stadium (which I highly recommend), you are sitting on top of all those skulls. Literally. The anthropology building is nestled right in under the seats.

    June 5, 2012 at 15:43 | Report abuse | Reply
  3. Chief Little Skull

    Don't get too excited thinking people are getting smarter. What they didn't tell you is that the size of the average human braincase has been decreasing for the last 3,000 years. So this latest finding is probably just due to better nutrition and health care. 150 years is not enough time for evolution to increase the size so drastically (by a centimeter).

    June 5, 2012 at 16:30 | Report abuse | Reply
    • haha

      Humans since the early 1900s have been testing 20% higher on IQ tests every generation, people are becoming smarter. The braincase geting smaller is because over time the brain has evolved and works more efficently like a prius, you dont need a semi truck and trailer to get you where you need to go

      June 5, 2012 at 20:04 | Report abuse |
    • Chris

      Neanderthal craniums were significantly larger than AMH skulls and they were far more physically robust than we are. There's a LOT more to it than sheer size. Also, for all those who aren't scientifically inclined, evolution is measure by entire populations (like the whole of humanity) over many many many generations and is noted by genetic mutations, not just physical appearance.

      June 5, 2012 at 20:31 | Report abuse |
    • Guest1351235

      Haha, IQ test does NOT represent raw "intelligence"
      Make an IQ test, then go back to college, mathematics degree, for 2 or 3 years, then re-do the test, you will have drastically improved your IQ...
      Yes I know, quite a lot of work just to test this hypothesis 🙂 ...
      You can also look at twin brothers who have done completely different choices in education...

      June 6, 2012 at 03:58 | Report abuse |
  4. midwife ellen

    Giving birth is certainly a lot safer today than a century of two ago, but Cesareans account for only a small part of the improvement. More important are the development of antibiotics, blood banking, the germ theory of disease and development of sterile technique, effective drugs to reduce hemorrhage, the eradication of polio and rickets (diseases which deformed the pelvis), and public health measures like clean water. Modern methods of birth control, especially to prevent pregnancy at the extremes of reproductive age (under 20, over 40) and the dangers of having more than 5 children also play a vital role in preventing maternal deaths. So does safe, legal abortion.

    June 5, 2012 at 16:39 | Report abuse | Reply
  5. Claudia, Houston, Tx

    I find this interesting simply because years ago when a black baby was born the parents determined that the size of their head, especially the forehead, determined the intelligence of the child. Our African ancestors still practice shaping their childrens head and they too are very intelligent people.

    June 5, 2012 at 17:43 | Report abuse | Reply
  6. TruthSpeaker

    Psuedoscience in action.

    June 5, 2012 at 19:53 | Report abuse | Reply
    • Oracle


      June 5, 2012 at 20:33 | Report abuse |
    • Matt

      Pseudoscience (n): What people who don't believe in science call science

      Psuedoscience (n): How those idiots spell psedoscience

      June 5, 2012 at 21:16 | Report abuse |
    • Matt

      Pseudoscience (n): What people who don't believe in science call science

      Psuedoscience (n): How those idiots spell pseudoscience

      June 5, 2012 at 21:17 | Report abuse |
    • Redford

      Whadya mean???? This explains Barry Bonds.

      June 5, 2012 at 23:21 | Report abuse |
  7. M.E.

    Huh, I wonder what the odds were then that my significantly part-Danish self would meet and marry my significantly part-Danish husband. As if it wasn't bad enough that my mom's side invaded my dad's side a thousand years ago, lol.

    June 5, 2012 at 19:56 | Report abuse | Reply
  8. The Contentious Otter

    I would tend to think this is a result of living in controlled indoor environments. Because we have learned to seal off our dwellings with glass windows, wooden doors, etc., our bodies are subject to less environmental stress and therefore the body has more energy to devote to brain development. It's a process that's somewhat similar to the increase in brain size that occurred when humanoid species first encountered shellfish and seafood.

    June 5, 2012 at 19:57 | Report abuse | Reply
  9. BRUCE


    June 5, 2012 at 19:59 | Report abuse | Reply
    • Dave

      You were apparently an Apprentice and crawled under his desk.

      June 5, 2012 at 20:02 | Report abuse |
    • Piers

      But it's mainly his rug.

      June 6, 2012 at 00:50 | Report abuse |
  10. Dave

    We all know that Obama`s head has become enormous recently. Don`t worry America, it will shrink like a prune in November. Just watch and see.

    June 5, 2012 at 20:00 | Report abuse | Reply
    • ChurnTheNews

      You are so dumb

      June 5, 2012 at 20:05 | Report abuse |
    • Paula D.

      It's Bush's fault!

      June 5, 2012 at 20:20 | Report abuse |
  11. sirrahad

    We are showing more genetic issues, too, i.e.; autism, predisposition to cancer and heart disease, psychiatric disorders, etc. Fair trade? Time will tell...

    June 5, 2012 at 20:02 | Report abuse | Reply
    • Kristin B

      I too have wondered if the increase in autism is a result of the evolution of the human brain.

      June 5, 2012 at 21:13 | Report abuse |
  12. A

    Ok, from a non-scientist POV....this kind of makes sense. I was on an 8th Grade Trip to D.C. and we visited the Ford Theater and where Lincoln Died. My first remark was "oh my, it is so small in here!' So, I don't think it's a shock that things in us are getting bigger.

    June 5, 2012 at 20:10 | Report abuse | Reply
  13. Lizzy10

    So much space, so little thought.

    June 5, 2012 at 20:15 | Report abuse | Reply
    • sirrahad

      Well said, Lizzy. Witness our friends Dave and Bruce (above).

      June 5, 2012 at 20:19 | Report abuse |
  14. Uthor

    I believe I know some people this has happened to... it's often for no apparent reason either.

    June 5, 2012 at 20:17 | Report abuse | Reply
  15. Shifter

    If this is indeed true, why is there still so much rampant stupidity in this world?

    June 5, 2012 at 20:17 | Report abuse | Reply
    • Oracle

      Because bigger heads and brains in humans has no correlation to being smarter.

      It's not the size of the brain, but the organization.

      June 5, 2012 at 20:31 | Report abuse |
    • Bud in NC

      Read the article. It said that the skull is getting larger, but the brain may not be getting larger. The difference is about that of a tennis ball. The difference is most surely filled with AIR. I know lots of air heads. That proves it.

      June 5, 2012 at 23:01 | Report abuse |
  16. Lila

    For starters, Hispanic is not a race. It's embarrassing to read American research implying that it is, it should have Asian/Mongoloid instead. Anyone who travels or has old photographs of people from even a hundred years ago can see a significant change not only in head size but body frame. We are much larger and we look thicker(not fat wise). The Boomer Generation really jumped in size when compared to their parents.

    June 5, 2012 at 20:19 | Report abuse | Reply
    • Oracle

      They're in error, but so are you!

      Hispanics, Asians, and anybody else except Caucasians are all derived from Africans. People see them as different from adaptation, not evolution. They're the same creature... African Human, or modern man!

      The only real difference is that Africans from Africa are capable of producing more types of new humans due to their higher genetic diversity.

      June 5, 2012 at 20:30 | Report abuse |
    • Lila

      ???? What in the world are you talking about? There are only 3 races, 4 if we include the Aborigines as a separate race. They are probably the "purest humans" on the planet because they were geographically isolated for so long. Everything you wrote doesn't make any sense.

      June 5, 2012 at 20:35 | Report abuse |
    • Oracle

      Obviously you have no education, there is only ONE race, the African race of modern humans.

      Have you EVER heard of DNA???

      June 5, 2012 at 21:27 | Report abuse |
    • vulpecula

      Africa for a long time had the largest gene pool, but with all the races in the U.S. now, I can hardlt beleave that ours isn't the most diverse in the world now. At least in the metropolitan areas. We are a true melting pot.

      June 5, 2012 at 21:33 | Report abuse |
    • Lila

      Oracle I can't figure out if you are trolling or just simply ignorant.

      June 5, 2012 at 22:05 | Report abuse |
  17. Paula D.

    I knew it!! The little grey aliens are actually US... just coming back for a visit after inventing the time machine, of course. Love it!

    June 5, 2012 at 20:19 | Report abuse | Reply
  18. Oracle

    LOL, Race is VERY important!

    Caucasians are the least human of all of us, and they also have larger heads, just like their ancestors the Neanderthals.

    Humans have smaller heads and brains, and the human brain is organized better producing more intelligent people than is possible with Caucasians.

    Have you ever wondered why no foundation of civilization has come from ANY European? Not mathematics, astronomy, medicine, engineering, governing systems, religion, NOTHING!

    Caucasians simply aren't capable of civilization creation, but they do a good job of copying it and pretending that they did.

    June 5, 2012 at 20:26 | Report abuse | Reply
    • sirrahad

      Oracle, in order of your debunkments of the Causasian race:
      Mathematics: Pythagoras
      Astronomy: Galileo
      Medicine: Hippocrates
      Engineering: J. Robert Oppenheimer
      Governing Systems: B. Franklin et al
      Religion: Well, you've got me on that one.

      June 5, 2012 at 20:39 | Report abuse |
    • BT

      That is the stupidest and least logical thing ever. Ever heard of Einstein? Or the large majority of inventors, innovators, and scientists? Caucasian, stupid.

      June 5, 2012 at 20:46 | Report abuse |
    • RacistsComeInAllColors

      That just may be the dumbest thing anyone has ever written on the internet. If you are trying to troll, bravo sir, my hat's off to you. If you actually believe that crap, please for the love of all that is good, kill your self before you have kids and infect them w/ your racist nonsense.

      June 5, 2012 at 20:49 | Report abuse |
    • NJ

      People like you should be exterminated or at least sterilized so you cannot propagate your own stupidity. If I had 32 people like you in the same room, I would have a full set of teeth, maybe.

      Call us when your flat-earth society meeting is over.

      June 5, 2012 at 21:14 | Report abuse |
    • Oracle

      Yeah, you guys show the proof that Caucasians are not the sharpest knives in the drawer.

      Obviously you people have no concept of history.

      Oracle, in order of your debunkments of the Causasian race:
      Medicine: Hippocrates – EVERY MEDICAL SYSBOL IS EGYPTIAN
      Governing Systems: B. Franklin et al – WHAT'S WRONG WITH YOU GUYS NUBIA, EGYPT, GREECE, ROME
      Religion: Well, you've got me on that one – NO, I HAVE YOU ON EVERYTHING

      BTW, Hebrews/Jews are AFRICAN, not European, so Einstein isn't Caucasian, and neither are the FIRST Africans out of Africa, the Asians, who gave you the printing press, gun powder, and jet planes.

      June 5, 2012 at 21:42 | Report abuse |
    • andrew

      everyone who replied to this is an idiot, he's obviously trolling

      Obvious history troll is trolling history obviously

      June 5, 2012 at 21:44 | Report abuse |
    • guest

      There is a reason why hispanics and blacks were not included in the study my friend. You probably represent one of these groups with your small brain.

      June 5, 2012 at 21:53 | Report abuse |
    • Oracle

      What may be helpful is for you guys to pick up a history book and see what Europeans were doing, oh say, 0 BC, and then look at what Africans were doing in Egypt at arouns, say 3000 BC.

      Building Pyramids that you can't build today, performing brain surgery and abortions. Charting stars that it took Caucasians having computers and telescopes to see and understand. Building buildings and structures on the mathematical pattern of growth, and encoding information is a language that lasts forever... mathematics.

      All medical and electrical symbols are Egyptian, all 3 major religions are Egyptian, and most of the Africans on the West coast are decended from Egyptians.

      BTW, Greeks and Romans(Italians) are genetically African, the only ones that aren't are the Europeans, who are 91-100% African.

      Don't go calling some racist simply because you lack the knowledge to understand the facts. Study history, and study the genetic makeup of Caucasians, and you'll see that they're the only ones with high concentrations of Neanderthal DNA!

      June 5, 2012 at 21:53 | Report abuse |
    • Oracle

      Here's a youtube of the National Geographic Program called "The search for Adam".

      If you want to know about humans, it's a good start – http://www.youtube.com/watch?v=y_nNNoT4Kbg

      June 5, 2012 at 21:57 | Report abuse |
    • guest

      I don't think that anyone has called you a racist. I think what they are saying is you are a freakin' lunatic. Name one technological achievement that you use on a daily basis that wasn't developed by a caucasian. The car you drive to work in, the airplane you fly in, the computer you are using right now sitting in your mom's basement to post your idiotic ramblings.

      June 5, 2012 at 22:07 | Report abuse |
    • Lila

      What race are people from Egypt, the ME, India? Hint: they are not black.

      June 5, 2012 at 22:07 | Report abuse |
    • Lilly

      Oracle, just because a person lives in Africa does not make them Black. North African Arabs and Jews are White belonging to the Caucasian race and so are people like the Berbers. Do not mix geography with race. And as far as the latest findings go, all present day humans came out of Africa, with one branch staying East African and another moving West, one went up through the Middle East through to the Caucasus, where it is thought the diverentiations came about that made up the Orientals and Europeans – this area being know as the nursery of the human race. Also, it seems that there were other types of humans such as the Neanderthals which they know discovered had also mated with the our of Africa humans as traces of their genes can be found in Europeans.

      As far as fhe inventions that you mentioned, most, if not all, are the product of the Caucasian or White race, no matter in which continent they lived, Africa, Europe, America. This is something that cannot be disputed. Even ancient peoples such as the Egyptians, Phoenicians and Hebrews were of Caucasian stock, although in the case of the ancient Egyptians there could have been some intermingling with Nubians, however Cleopatra, the most famous Queen of Egypt was of Greek descent.

      June 5, 2012 at 23:00 | Report abuse |
  19. KWS

    I am NOT getting a big head! MODESTY is my greatest trait!

    June 5, 2012 at 20:29 | Report abuse | Reply
  20. Mike

    Americans are DEFINITELY NOT getting smarter

    June 5, 2012 at 20:34 | Report abuse | Reply
    • vulpecula

      They are getting smarter, just not fast enough. More Americans need to go into the Sciences and Engineering if we're going to compete with the rest of the world.

      June 5, 2012 at 21:05 | Report abuse |
    • guest

      what is intelligence anyways, so many ways to measure it. IQ, organizational capacity, creativity... It seems that when one of these increases another is decreased.

      June 5, 2012 at 21:56 | Report abuse |
  21. Katie

    I had to have two C-sections because the babies didn't fit my birth canal. I pushed the first one stuck and we tried everything to get him unstuck, but after three hours of different positions and manipulations his heart rate started to drop and we had to get him out quickly. The second baby never descended – just wouldn't fit. They weren't monstrously big (both nearly nine pounds)- my sister had bigger babies without trouble – just too big for me. Now I can say it's because of evolution. Not that the anti-C-section people would change their dim view of me....

    June 5, 2012 at 20:38 | Report abuse | Reply
    • .

      They shoulda got a broom stick and shoved the bas trd back up where he came from.

      June 5, 2012 at 21:10 | Report abuse |
  22. longtooth

    My head is wicked big, and I am wicked smart. Size matters.

    June 5, 2012 at 20:38 | Report abuse | Reply
    • .

      My dick is bigger and smarter than you.

      June 5, 2012 at 21:09 | Report abuse |
  23. Peter Gabriel

    Big Time! My head's gettin' bigger.
    Big Time! And my moooouuuthhh...

    June 5, 2012 at 20:39 | Report abuse | Reply
    • .

      My dick is getting bigger, too.

      June 5, 2012 at 21:08 | Report abuse |
    • sirrahad

      My guess is that the two are the same.

      June 5, 2012 at 21:26 | Report abuse |
  24. RepentSinners

    Anyone that believes these lies of the devil are witches I say, WITCHES! Man was created in the exact, unchangeable image of GOD 6000 years ago. These heathens are going to HELL!!!!

    June 5, 2012 at 20:42 | Report abuse | Reply
    • Unrepentant

      Trolls are evolving too!

      June 5, 2012 at 21:02 | Report abuse |
  25. allen

    Let's see... if the skull gets bigger, we wear a larger hat, if we need a larger hat we must have more head, and more head is a good thing. The bigger head measurement are probably made on republicans, who seem to be pretty big headed lately.

    June 5, 2012 at 20:52 | Report abuse | Reply
    • vulpecula

      can never have too much head. hehe

      June 5, 2012 at 21:42 | Report abuse |
  26. studdmuffins

    Heads as well as our mid-sections.

    June 5, 2012 at 20:58 | Report abuse | Reply
    • .

      Don't forget the badonkadonks.

      June 5, 2012 at 21:07 | Report abuse |
  27. Chris

    I would be more surprised if skull size was staying the same, and less surprised if skulls were getting smaller.

    June 5, 2012 at 21:01 | Report abuse | Reply
  28. .

    Neil Cavuto's head is freakin' huge!

    June 5, 2012 at 21:07 | Report abuse | Reply
  29. Lew

    Classical Greek philosophers were around thousands of years ago, thus making their heads smaller than ours as well (according to the logical assumptions made in this article) but wisdom did indeed exist. At least we can say that Socrates and Plato weren't getting high on bath salts. Or, were they...

    June 5, 2012 at 21:10 | Report abuse | Reply
  30. Matt

    Pseudoscience (n): What people who don't believe in science call science

    June 5, 2012 at 21:15 | Report abuse | Reply
  31. vulpecula

    Almost eveyone is jumping on bigger brains when the article clearly says it did not measure brain size. A big factor is probable longer life spans, thus more time to grow. Another factor obviously is nutrition, but what about less people smoking. And then there is diet. not just what we consume, but how we consume it. So many foods now days are so overly processed. It could have an impact on how much muscle, bone and conctive tissue and individual has. Two humans, one eating a lot of raw grains and nuts is going to be structurally different what one that eats twinkies every day, even if there dna was exactly the same.

    June 5, 2012 at 21:15 | Report abuse | Reply
    • vulpecula

      I really need to start proof reading my comments. I hate these forums that don't let you edit. 😛

      June 5, 2012 at 21:52 | Report abuse |
  32. JohnBorg

    Actually, I have much trouble believing that we are growing more intelligent. There's no way to measure this, per se. Also, this may be used to legitimate superiority over other peoples, much as the construction of race did during the colonial era. I'm not saying that its impossible, but that other factors should be more seriously considered.

    June 5, 2012 at 21:16 | Report abuse | Reply
    • vulpecula

      I think it's pretty clear we are more intelligent, But I think it's only due to better education and better excess to information. And nothing to do with bigger brain capacity. As for the "race" issue, I'm a firm beleiver that all the human race has the capacity irregardless of their ethnicity, as long as that education starts soon enough. The first 3 years are critical in a childs life.

      June 5, 2012 at 21:26 | Report abuse |
  33. Rags

    Even though the article says our heads are geting bigger does not mean our brains are keeping up with either the space allotted or any more knowledge than before. Frankly, I think the newer generation are dumbing down and heading toward caveman days. Think I'm wrong? Ask any younger person a common sense question and all you may get is Duh?
    So called Smart phones are dumbing down the youngsters.

    June 5, 2012 at 21:20 | Report abuse | Reply
    • r2g

      You probably would've succeeded in saying technology was the reason for people losing intelligence had you not have used the internet. Just saying.

      June 5, 2012 at 21:50 | Report abuse |
  34. martin2176@yahoo.com

    its due to the burgers and hot dogs we eat

    June 5, 2012 at 21:21 | Report abuse | Reply
  35. zeyn2010

    We are becoming cone heads! Like the elongated skulls found in Peru! We do need to figure out what happened to past advanced civilizations so we can help ourselves before it happens again!

    June 5, 2012 at 21:23 | Report abuse | Reply
  36. whatever

    Actually black and hispanic skulls have been found. Hispanic skulls have been getting pointer and dumber. While black skulls are looking more and more neanderthal a bit more monkey.

    June 5, 2012 at 21:34 | Report abuse | Reply
    • choo

      Pointer and dumber? Really? You aren't even good at bigotry.

      June 5, 2012 at 21:39 | Report abuse |
    • choo

      Ironically, all but Africans have neanderthal blood. Look that up, genius.

      June 5, 2012 at 21:40 | Report abuse |
  37. Genericman

    Bigger waistlines

    June 5, 2012 at 21:35 | Report abuse | Reply
  38. choo

    I don't buy it. But, people are getting taller and fatter – both of which are correlated with an increased brain size.

    June 5, 2012 at 21:37 | Report abuse | Reply
  39. lex

    If part of this is the result of more intermarriage, does that mean the gene pool is being diluted? Isn't it a good thing for the human race to have bio-diversity to handle whatever the future may hold ?

    June 5, 2012 at 21:37 | Report abuse | Reply
  40. Kandi

    Agent Mulder reported this in his X-Files.

    Nothing new.

    June 5, 2012 at 21:44 | Report abuse | Reply
  41. vulpecula

    It's all the hormones they put in the food. In 1000 years, we will all look like cows.

    June 5, 2012 at 21:46 | Report abuse | Reply
  42. P. O. Carl

    Bigger heads, but not smarter.

    June 5, 2012 at 22:05 | Report abuse | Reply
  43. Annie

    Whew! Glad to know it. I do a lot of community theater with a group that has been around for 90 years and we have a lot of ladies' vintage hats. NONE of them fit my head.

    June 5, 2012 at 22:09 | Report abuse | Reply
    • vulpecula

      leather headbands will shrink with time if not stretched by wearing. I have military berets that I wore in the 1980s that I can't wear now.

      June 6, 2012 at 03:29 | Report abuse |
  44. Adam

    Sure, our heads get bigger, that just the beginning. Then we advance into outer space and our muscle mass deteriorates due to low gravity and bad food and we get thin and wiry. Predatory senses of smell and hearing become less important locked in a spaceship so the nose and ears shrink away over time. Our eyes become enlarged due to a combination of vision becoming our primary source of information and 192” TVs. We ARE the Greys! And then for some reason we develop time travel and come back to probe ourselves right in the annals. That’s sounds sooo like us. Just a theory really.

    June 5, 2012 at 22:13 | Report abuse | Reply
  45. JeffinIL

    Just read the comments on Internet boards. Heads are definitely getting bigger.

    June 5, 2012 at 22:43 | Report abuse | Reply
  46. Merlin

    The transformation is under way... I can feel my cranium just bounding with knowledge and growing by the minute...At least in the next 10000 years...

    June 5, 2012 at 22:44 | Report abuse | Reply
  47. dustbunny44

    But we all know that people are taller than before due to better diet and nutrition and calcium intake. How does taller correlate to larger skull size? Are skulls larger only because people are taller? We don't know because this article sucks.

    June 5, 2012 at 23:15 | Report abuse | Reply
  48. topdog

    human heads are getting smaller. the brain power is INVERSELY proportional the the number of offspring each human has. i.e., smaller brains are having more babies and passing on the dumb genes

    June 5, 2012 at 23:16 | Report abuse | Reply
  49. Keksi

    Heads are bigger because there are more aliens living in USA.

    June 5, 2012 at 23:19 | Report abuse | Reply
  50. Richard Cranium

    Yep, my head is definitely getting bigger.

    June 5, 2012 at 23:25 | Report abuse | Reply
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Get a behind-the-scenes look at the latest stories from CNN Chief Medical Correspondent, Dr. Sanjay Gupta, Senior Medical Correspondent Elizabeth Cohen and the CNN Medical Unit producers. They'll share news and views on health and medical trends - info that will help you take better care of yourself and the people you love.