home
RSS
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 (856 Responses)
  1. Content Marketing Agency Orange County

    https://www.pagelender.co.uk/__media__/js/netsoltrademark.php?d=affordableranking.com

    May 9, 2021 at 14:56 | Report abuse | Reply
  2. Digital Marketing Videos

    A motivating discussion is definitely worth comment. I believe that you need to publish more about this issue, it might not be a taboo subject but usually folks don't speak about such subjects. To the next! All the best!!

    https://www.hannahlent.com/__media__/js/netsoltrademark.php?d=www.affordableranking.com

    May 9, 2021 at 19:51 | Report abuse | Reply
  3. Google Marketing Experts

    http://www.nhomag.com/adredirect.asp?url=http://affordableranking.com

    May 10, 2021 at 14:17 | Report abuse | Reply
  4. Internet Marketing Mechanics

    An impressive share! I have just forwarded this onto a co-worker who was conducting a little research on this. And he actually ordered me breakfast simply because I stumbled upon it for him... lol. So allow me to reword this.... Thanks for the meal!! But yeah, thanx for spending time to discuss this matter here on your website.

    http://www.spunkymodels.com/cgi-bin/atx/out.cgi?trade=http://www.affordableranking.com

    May 10, 2021 at 16:05 | Report abuse | Reply
  5. Internet Marketing Companies

    http://www.booksonmove.com/home/?selectcountry=TM&redurl=http://affordableranking.com

    May 10, 2021 at 16:13 | Report abuse | Reply
  6. Seo Marketing Jobs

    Your style is unique in comparison to other people I have read stuff from. Many thanks for posting when you have the opportunity, Guess I will just book mark this site.

    https://www.gene-simmons.com/__media__/js/netsoltrademark.php?d=affordableranking.com

    May 10, 2021 at 21:08 | Report abuse | Reply
  7. Social Media Marketing Job Orange County

    https://taiwancosmed.com/__media__/js/netsoltrademark.php?d=affordableranking.com

    May 10, 2021 at 21:58 | Report abuse | Reply
  8. Internet Marketing Mechanics

    I quite like looking through an article that will make men and women think. Also, thank you for allowing for me to comment!

    http://winering.info/__media__/js/netsoltrademark.php?d=affordableranking.com

    May 10, 2021 at 23:34 | Report abuse | Reply
  9. Seo Marketing Orange County

    http://autoservice.co.id/blogs/view/affordableranking.com

    May 11, 2021 at 00:47 | Report abuse | Reply
  10. Seo Marketing Company

    http://www.metrofmjuina.com.br/banner_conta.php?id=6&link=http://www.affordableranking.com

    May 11, 2021 at 03:36 | Report abuse | Reply
  11. Cornelius Barbiere

    Have you ever heard of second life (sl for short). It is basically a game where you can do anything you want. SL is literally my second life (pun intended lol). If you want to see more you can see these Second Life websites and blogs

    http://herald.blogs.com/slh/2008/11/something-wicke.html?cid=138275552

    May 11, 2021 at 03:44 | Report abuse | Reply
  12. Local Marketing Videos

    This website definitely has all the information and facts I needed concerning this subject and didn’t know who to ask.

    https://www.sportcorsaclub.com/__media__/js/netsoltrademark.php?d=affordableranking.com

    May 11, 2021 at 05:02 | Report abuse | Reply
  13. Video Marketing Services

    Spot on with this write-up, I actually think this website needs far more attention. I’ll probably be returning to see more, thanks for the info!

    https://medicmap.ru/redirect?url=https://affordableranking.com

    May 11, 2021 at 06:02 | Report abuse | Reply
  14. Google Marketing Agencies

    https://www.shellopener.net/__media__/js/netsoltrademark.php?d=www.affordableranking.com

    May 11, 2021 at 13:08 | Report abuse | Reply
  15. Seo Marketing Consultant

    This blog was... how do you say it? Relevant!! Finally I have found something which helped me. Thanks a lot!

    https://arkansascatholic.com/__media__/js/netsoltrademark.php?d=affordableranking.com

    May 11, 2021 at 13:36 | Report abuse | Reply
  16. Content Marketing Brea

    http://countryclubahmedabad.com/?wptouch_switch=desktop&redirect=http3A2F2Fboosterpackforlife.com

    May 11, 2021 at 14:23 | Report abuse | Reply
  17. oc collision center

    https://sc.hkex.com.hk/gb/www.youtube.com/watch?v=ucdumhFqZQc

    May 11, 2021 at 19:39 | Report abuse | Reply
  18. RV Tires Near Me

    http://glamourstix.biz/__media__/js/netsoltrademark.php?d=youtube.com/channel/UChUH5GdtSzHx6V02C90mnfQ/videos

    May 11, 2021 at 21:01 | Report abuse | Reply
  19. where to buy rv furniture

    http://admsapi.businessweekly.com.tw/?w=408691ac-acd6-4c54-b973-1a0f3d8fcffb&c=a85512e7-29e2-4eb5-8744-1767c0122729&p=11FA92D8-D718-4768-8364-ED0F4EC976D1&a=a188cc7b-1ba1-41da-a070-4d25fc82a98a&po=e1c41fc0-17d2-4c56-b716-d4a2c579a64d&s=6ac78b7f-21a1-47bc-b320-65ad67f39446&m=5bf58492-6afe-42cf-bf12-c1c7cc29679b&u=https://ocrv.mobi/rv-interior-remodel-near-me

    May 11, 2021 at 21:16 | Report abuse | Reply
  20. geico painting commercial

    http://3d.skr.jp/cgi-bin/lo/refsweep.cgi?url=https://ocrv.me/state-farm-rv-collision-repair-shop-near-me

    May 12, 2021 at 00:11 | Report abuse | Reply
  21. RV Plumbing Los Angeles

    https://historyhub.history.gov/external-link.jspa?url=https://youtube.com/channel/UChUH5GdtSzHx6V02C90mnfQ/videos

    May 12, 2021 at 00:46 | Report abuse | Reply
  22. RV Dent Repair Los Angeles

    Pretty! This has been an incredibly wonderful post. Many thanks for providing this information.

    https://www.allspray.biz/__media__/js/netsoltrademark.php?d=yelp.com/biz/ocrv-center-yorba-linda-2

    May 12, 2021 at 01:31 | Report abuse | Reply
  23. RV Collision Repair Orange County

    http://www.jdmclubhouse.com/index.php?thememode=full;redirect=http://www.facebook.com/ocrvcenter

    May 12, 2021 at 03:27 | Report abuse | Reply
  24. rv parts indio

    This is a topic that is near to my heart... Take care! Where are your contact details though?

    http://emails.erieinsurance.com/ern40/c2.php?ERIN/37662445/139490/H/N/V/https://ocrv.vip/motorhome-furniture-repair-near-me

    May 12, 2021 at 03:37 | Report abuse | Reply
  25. RV Windows Near Me

    I couldn’t refrain from commenting. Well written!

    http://recycleasiaalliance.com/__media__/js/netsoltrademark.php?d=www.instagram.com/ocrvcenter

    May 12, 2021 at 03:46 | Report abuse | Reply
  26. vans store orange county

    https://www.saisoncard.co.jp/cgi-bin/count.cgi?pal=632,632&url=https://ocrv.xyz/rv-repair-shop-toluca-lake-california

    May 12, 2021 at 04:23 | Report abuse | Reply
  27. Marchelle Cardiel

    This was great! I would like you to clean up all this spam though

    https://www.linkedin.com/in/yusuf-hanafy-82493b183

    May 12, 2021 at 04:36 | Report abuse | Reply
  28. rv and trailer repair

    http://kousei.web5.jp/cgi-bin/link/link3.cgi?mode=cnt&no=1&hpurl=https://youtube.com/watch?v=27bY06gvk0o

    May 12, 2021 at 04:51 | Report abuse | Reply
  29. Mercedes Sprinter Repair Shops

    https://www.ics.org/Wasabi/Common/Logout.aspx?Returnurl=https://boxtruckrepairshop.com/leisure-travel-van-repair-shop-near-me

    May 12, 2021 at 07:21 | Report abuse | Reply
  30. car sound system repair near me

    I’m amazed, I must say. Seldom do I encounter a blog that’s equally educative and interesting, and let me tell you, you have hit the nail on the head. The problem is something too few people are speaking intelligently about. Now i'm very happy I came across this in my search for something regarding this.

    https://orphus.ru/redir.php?https://youtube.com/watch?v=4lQ-nB48O2Y

    May 12, 2021 at 10:40 | Report abuse | Reply
  31. RV Dashboard Orange County

    The very next time I read a blog, I hope that it does not disappoint me just as much as this one. I mean, I know it was my choice to read, but I really thought you would probably have something interesting to talk about. All I hear is a bunch of whining about something you could fix if you weren't too busy looking for attention.

    http://www.fordonsproffs.eu/custom/redirect.aspx?url=http://www.g.page/OCRVFleetServices

    May 12, 2021 at 13:57 | Report abuse | Reply
  32. motor home repair parts

    http://www.bioscience.org/2017/v9s/af/474/fulltext.php?bframe=https://ocrv.art/rv-cabinet-repair-near-me

    May 12, 2021 at 18:22 | Report abuse | Reply
  33. things to do in azusa ca

    You are so awesome! I do not think I have read through something like that before. So nice to discover another person with a few original thoughts on this topic. Really.. thanks for starting this up. This website is something that is required on the internet, someone with a little originality!

    https://barbados.org/al/?event=ad.logClickampadvert=DC6FF007FAD78E23C54A673E3258DDC0EE638CB31CFE6FB9D0F4E0C53EF6B1276EC9DDCA3D10A7EA5E5F52955053E7F2A0C5D4D51F5050E21EC0B7F8CDCDA1EB3BBEEEDAB3EBDC25114C276741BA028E&webAddress=https://ocrv.mobi/rv-mechanic-near-me

    May 12, 2021 at 20:19 | Report abuse | Reply
  34. motorhomes for sale in orange county ca

    http://rd.fresheye.com/opg/web/1/?go=https://ocrv.vip/emergency-truck-collision-repair-shop-near-me

    May 12, 2021 at 20:26 | Report abuse | Reply
  35. all rv repair

    http://jp.local.com/__media__/js/netsoltrademark.php?d=ocrvmotorsports.com/cargo-van-collision-repair-shop-near-me

    May 12, 2021 at 22:09 | Report abuse | Reply
  36. RV Dashboard Riverside

    After looking at a number of the articles on your blog, I honestly like your way of blogging. I added it to my bookmark site list and will be checking back in the near future. Please visit my website too and tell me how you feel.

    http://www.bestcreditcards.info/__media__/js/netsoltrademark.php?d=youtube.com/channel/UCGb9aC76nAmfzNsCru2KBHA/videos

    May 12, 2021 at 22:27 | Report abuse | Reply
  37. fiberglass store near me

    https://coyoacan.cdmx.gob.mx/link?ruta=https://ocrv.vip/rv-repair-shop-tustin-california

    May 12, 2021 at 23:06 | Report abuse | Reply
  38. Mercedes Sprinter Chasis Repair

    https://www.payrollservers.us/sc/cookie.asp?sitealias=25925711&redirect=https://fleetautorepairshop.com/conversion-van-repair-shop-near-me

    May 13, 2021 at 00:32 | Report abuse | Reply
  39. rv repair in riverside ca

    A motivating discussion is worth comment. I think that you should write more on this issue, it might not be a taboo subject but typically people do not talk about these subjects. To the next! Cheers!!

    http://www.freedback.com/thank_you.php?u=https://ocrvart.com/rv-plumbing-repair-near-me

    May 13, 2021 at 04:29 | Report abuse | Reply
  40. rv and camper repair near me

    Can I simply just say what a comfort to find someone who truly knows what they are talking about on the web. You certainly understand how to bring an issue to light and make it important. More people need to read this and understand this side of the story. I can't believe you aren't more popular since you most certainly have the gift.

    https://www.iaai.com/VehicleInspection/InspectionProvidersUrl?name=AA Transit Pros Inspection Service&url=https://ocrvcenter.co/loadstar-collision-repair-shop-near-me

    May 13, 2021 at 07:06 | Report abuse | Reply
  41. Sprinter Return Line Repair

    https://www.hypercomments.com/api/go?url=https://boxtruckrepairshop.com/mercedes-luxury-van-repair-shop-near-me

    May 13, 2021 at 09:03 | Report abuse | Reply
  42. orange county trailer

    http://webgozar.com/feedreader/redirect.aspx?url=https://ocrv.rocks/peterbuilt-collision-repair-shop-near-me

    May 13, 2021 at 09:14 | Report abuse | Reply
  43. windshield repair around me

    https://businesscatalyst.com/Redirect.aspx?destination=https://ocrvexperts.com/rv-repair-shop-seal-beach-california

    May 13, 2021 at 10:39 | Report abuse | Reply
  44. RV Interior Designer Near Me

    I'm very happy to discover this great site. I wanted to thank you for ones time for this particularly fantastic read!! I definitely liked every little bit of it and I have you saved as a favorite to see new things on your blog.

    http://www.arch.iped.pl/artykuly.php?id=1&cookie=1&url=http://facebook.com/ocrvcenter

    May 13, 2021 at 11:04 | Report abuse | Reply
  45. paint repair shop near me

    I like reading through an article that can make men and women think. Also, many thanks for permitting me to comment!

    http://www.publicbroadcasting.net/wrti/.jukebox?action=viewPodcast&podcastId=7003&url=https://ocrv.guru/thor-trailer-collision-repair-paint-shop-near-me-orange-county

    May 13, 2021 at 15:54 | Report abuse | Reply
  46. leather repair orange county

    I need to to thank you for this fantastic read!! I certainly loved every little bit of it. I have got you book marked to check out new stuff you post…

    https://uhr.rutgers.edu/download/135?url=https://ocrvart.com/rv-lighting-repair-near-me

    May 13, 2021 at 16:07 | Report abuse | Reply
  47. RV Wraps Riverside

    http://www.krung.ru/bitrix/rk.php?goto=http://www.facebook.com/ocrvcenter

    May 13, 2021 at 19:20 | Report abuse | Reply
  48. motorhome remodeling companies

    http://apps.vienna.at/feat/microsite/webcams/welcome.asp?url=ocrv.info/motorhome-kitchen-repair-near-me

    May 13, 2021 at 20:37 | Report abuse | Reply
  49. travel trailer repair near me

    https://asi.ru/bitrix/rk.php?goto=https://ocrvcenter.mobi/class-8-truck-collision-repair-shop-near-me

    May 13, 2021 at 21:35 | Report abuse | Reply
  50. truck repair close to me

    I need to to thank you for this wonderful read!! I certainly enjoyed every little bit of it. I have got you bookmarked to look at new things you post…

    https://www.docin.com/jsp_cn/mobile/tip/android_v1.jsp?forward=https://ocrvart.com/prevost-rv-collision-repair-paint-shop-near-me-orange-county

    May 13, 2021 at 21:48 | Report abuse | Reply
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Leave a Reply to Repair 2006 Dodge Sprinter


 

CNN welcomes a lively and courteous discussion as long as you follow the Rules of Conduct set forth in our Terms of Service. Comments are not pre-screened before they post. You agree that anything you post may be used, along with your name and profile picture, in accordance with our Privacy Policy and the license you have granted pursuant to our Terms of Service.

Advertisement
About this blog

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.

Recent Comments
Archive
June 2012
M T W T F S S
 123
45678910
11121314151617
18192021222324
252627282930  
  • An error has occurred, which probably means the feed is down. Try again later.