![]() |
|
![]()
June 5th, 2012
02:43 PM ET
Americans' heads have been growing, scientists sayIf 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. 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. |
![]() ![]() ![]() ![]() 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. |
|
I’m impressed, I must say. Seldom do I come across a blog that’s both equally educative and engaging, and let me tell you, you have hit the nail on the head. The issue is something which too few folks are speaking intelligently about. I'm very happy that I found this in my hunt for something concerning this.
http://sendfwd.com/__media__/js/netsoltrademark.php?d=theocrv.com/passenger-truck-collision-repair-shop-near-me
http://www.contentmove.biz/__media__/js/netsoltrademark.php?d=youtube.com/channel/UCCWA5o3d2u11KvEjA3wLVUA/videos
I love it when individuals get together and share opinions. Great blog, continue the good work!
https://officialsportsbetting.com/go.php?https://instagram.com/ocrvcenter
https://www.domainsherpa.com/share.php?site=https://ocrv.mobi/bucket-truck-collision-repair-shop-near-me
I have to thank you for the efforts you have put in writing this blog. I am hoping to view the same high-grade content from you in the future as well. In fact, your creative writing abilities has inspired me to get my own, personal site now 😉
http://bing.com/news/apiclick.aspx?ref=FexRss&aid=&url=http://yelp.com/biz/ocrv-center-anaheim&cc=ru
Pretty! This was an extremely wonderful article. Many thanks for providing these details.
http://jackteklimited.com/__media__/js/netsoltrademark.php?d=youtube.com/channel/UCCWA5o3d2u11KvEjA3wLVUA/videos
Very good article! We are linking to this particularly great post on our site. Keep up the good writing.
http://durad.de/backlink_abfrage/index.php?ext_url=http3A2F2Fwww.g.page/ocrvcenter
http://ms.zzedu.net.cn/link.jsp?url=https://ocrvcenter.biz/rv-repair-shop-fontana-california
The next time I read a blog, I hope that it does not disappoint me just as much as this one. After all, I know it was my choice to read, however I genuinely believed you'd have something useful to say. All I hear is a bunch of whining about something that you could possibly fix if you were not too busy looking for attention.
https://www.neoromance.info/link/rank.cgi?mode=link&id=26&url=https://club-maserati.com
https://www.kristianstad.se/find_v2/_click?_t_id=1B2M2Y8AsgTpgAmY7PhCfg==&_t_q=biltvätt&_t_tags=language:sv,siteid:b47c99cb-a914-4f1b-8fba-9e4836a984f6&_t_ip=193.17.67.73&_t_hit.id=SvensktVatten_Web_Models_Pages_ArticlePage/_cbc5360e-69b3-4075-84fb-b15072516591_sv&_t_hit.pos=1&_t_redirect=https://ocrv.us/
https://www.seniorenportal.de/community/redirect?url=http://arizonasvision.com
http://lidl.media01.eu/set.aspx?dt_url=https://meganleary.com/
http://www.cssdrive.com/?URL=www.arizonasvision.com/
https://www.provenceweb.fr/immobilier/compte_clicks_web.php?id=&web=http://ocrvshop.com/
https://www.hammer.if.tv/cgi/search/rank.cgi?mode=link&id=2613&url=https://club-maserati.com
Way cool! Some very valid points! I appreciate you writing this write-up and the rest of the website is also really good.
http://www.track.twshop4coupon.com/track/clicks/3171/c627c2b89e0522dbfe9cbd2e8d2b8914736245cb75e9f0ab416db1046005?t=http://www.arizonasvision.com/
https://twpusc.org/Redirect.aspx?destination=https://meganleary.com
http://www.zhhsw.com/home/link.php?url=http://www.meganleary.com/
Excellent web site you have here.. It’s hard to find high quality writing like yours these days. I really appreciate individuals like you! Take care!!
https://www.runreg.com/Services/RedirectEmail.aspx?despa=www.club-maserati.com/&emid=7693&edid=2352980&secc=2345271
http://www.l-www.sitepal.com/affiliates/entry/?spdirect=1&affId=75895&promotionId=17691&link=https://fleetvehiclerepairshop.com
I couldn’t resist commenting. Exceptionally well written!
http://wtk.db.com/777554543598768/optout?redirect=https://ocrvshop.com
http://www.dir.tetsumania.net/search/rank.cgi?mode=link&id=3267&url=https://arizonasvision.com
Very good info. Lucky me I recently found your site by accident (stumbleupon). I've saved as a favorite for later!
https://www.chitaitext.ru/bitrix/redirect.php?event1=utw&event2=utw1&event3=&goto=https://internetmarketingwashington.com
https://aikareborn.com/members/skyrim7.21443
http://bigtorrent-ua.com/away.php?to=http://www.affordableranking.com/
http://www.inlinecertificationprogram.org/mailing-lists/link_in?mle_id=28715&mle_ver=5b1223e3050b719171608203553caafa&url=http3A2F2Faffordableranking.com
http://lawter-international.net/__media__/js/netsoltrademark.php?d=affordableranking.com
I quite like reading through a post that will make men and women think. Also, many thanks for allowing for me to comment!
https://www.continental-industry.com/catalogs/iap/Language/Switch?culture=en-GB&returnUrl=http://aikareborn.com
http://www.cresme.it/click.aspx?url=https://alatharnews.com/?p=1844
/
http://www.php-api.engageya.com/oper/https_redirect.php?url=http://www.aikareborn.com
https://www.info-az.net/search/rank.cgi?mode=link&id=675&url=https://hammer.ag/en/disclaimer/item/155-dummy-de?start=564860
https://www.olimpvl.ru/bitrix/redirect.php?event1=&event2=&event3=&goto=https://www.maseratis.net
http://eczanekur.com/ex_link/ex_link.asp?link=http://maseratiforum.net
http://ielts.org/api/sitecore/RecognisingOrganisations/RegisterGoalAndRedirect?ROId=F1FCFC07-CD4C-451E-9FB1-85D2EDF276BA&link=http://club-maserati.com
I don't know about you people but I infatuated with airplanes. I had a friend in highschool that loved airplanes, so here are some airplane related stuff I don't know about you guys but I love airplanes. I had a friend in highschool that loved airplanes, so here are some airplane related stuff https://www.airlinereporter.com/2009/12/airline-livery-of-the-week-klm-retro-livery/
http://privatejetstoday.blogspot.com/2010/08/private-jet-flight-attendant-jobs.html
I like reading through a post that can make people think. Also, thanks for allowing me to comment!
https://go.20script.ir/index.php?url=https://fleetservicesorangecounty.com/luxury-truck-shop-near-me
You are so interesting! I do not believe I've truly read through a single thing like that before. So great to find another person with some genuine thoughts on this subject. Really.. thanks for starting this up. This web site is one thing that is required on the web, someone with a little originality!
http://moe.gov.np/site/language/swaplang/1/?redirect=https://fleettruckrepairshop.com/box-truck-repair-shop-near-me
http://meteorite.lamost.org/modules/links/redirect.php?url=https://commercialvanrepairshop.com/van-restoration-shop-near-me
I was very happy to discover this site. I wanted to thank you for your time just for this wonderful read!! I definitely really liked every part of it and i also have you book-marked to look at new information on your blog.
https://buxcap.com/__media__/js/netsoltrademark.php?d=maseratis.net
I like reading through an article that will make people think. Also, thanks for permitting me to comment!
http://geowww.agrocampus-ouest.fr/portails/portail.php?portail=mh&mode=url&url=https://sprintervanrepairshop.com/truck-wrap-shop-near-me
https://www.fms.treas.gov/fmsweb/disclaimer.jsp?ciURL=https://www.fleetautorepairshop.com/van-body-shop-near-me/
Have you ever heard of second life (sl for short). It is essentially 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 authors and blogs
http://myvedana.blogspot.com/2006/02/dig-city.html
http://tamiroom.com/bbs/cafe.php?mode=node&id=936&page=1&home=fleettruckrepairshop.com/police-truck-repair-shop-near-me/
Great blog you've got here.. It’s difficult to find excellent writing like yours nowadays. I seriously appreciate people like you! Take care!!
https://www.iaccmeetings.com/Redirect.aspx?destination=https://commercialrepairshop.com/sprinter-van-dent-repair-shop-near-me/
Very good information. Lucky me I came across your website by chance (stumbleupon). I have book marked it for later!
https://www.site-navi.net/sponavi/rank.cgi?mode=link&id=890&url=https://fleetservicerepairshop.com/van-repair-shop-near-me/
Howdy! This blog post couldn’t be written much better! Looking at this article reminds me of my previous roommate! He constantly kept preaching about this. I will forward this information to him. Fairly certain he's going to have a great read. Many thanks for sharing!
http://www.bytecheck.com/results?resource=ocrvfleetservices.com/truck-alignment-shop-near-me
Saved as a favorite, I love your web site!
http://paper.li/SharonLaMothe/1411841847?read=fleetvehiclerepairshop.com/box-truck-paint-shop-near-me/
/
I could not resist commenting. Exceptionally well written!
http://channel.iezvu.com/share/UnboxingyanálisisdeChromecast2?page=https://maseratis.net/