Americans Skulls Getting Bigger
By Dave Mosher | NationalGeographic.com
Modern life may be going to your head.
Its not clear whymedicine? cars? supermarkets?but the skulls of white Americans, and perhaps of other races and nationalities, have become slightly taller and roomier, according to new forensic research.
New measurements of hundreds of skulls of white Americans born between 1825 and 1985 suggest that their typical noggin height has grown by about a third of an inch (eight millimeters).
It may not sound like much, but the growth translates to roughly a tennis balls worth of new brain room.
"I cant guess the implications of this jump in cranial size, but other research shows a bigger cranium doesnt necessarily mean more intellect," said University of Tennessee biological anthropologist Richard Jantz, who presented the findings with colleagues at an American Association for Physical Anthropology meeting in April.
Generation by generation, human heads may be growing. Paul Damien, National Geographic
Ups and Downs of Evolution
Beginning with the dawn of the first Homo species, human skulls evolved to be increasingly bigger until about 30,000 years ago, when head size plateaued.
And about 5,000 or 6,000 years ago, when agriculture took off in earnest, skulls began shrinking. The cause of the shrinkage is a mystery, but scientists have tentatively fingered more efficient brain wiring and easier access to food and safetythe idea being that people no longer had to be especially smart to survive (aka the Idiocracy theory).
About ten years ago Jantz and colleagues were measuring skeletons and saw signs that the shrinking trend may be reversing. Since then, theyve amassed data on 1,500 skulls spanning 160 years.
The specimens came from three collections to which only adult skeletons could be donated. And since mostly adult Caucasian Americans regularly donated to the collections, the researchers conclusions so far are known to apply to that group alone.
Americans Experimenting on Themselves?
Jantz cautioned that American life has changed in too many ways to pinpoint a single cause for the skull growth.
"I am absolutely certain, however, that its due to the unparalleled environment that we now live in," he said.
"Americans drive cars, vaccinate their childrenand an excess of food is now a bigger problem than undernutrition, among many other things. Its almost as if were conducting an experiment on ourselves to see how well respond to a totally new environment."
University of Texas demographer Corey Sparks said the new conclusions seem to be valid but was equally cautious not to suggest an exact cause.
"I grabbed a ruler to physically see the changes they describe, and eight millimeters is not much change at all. An inch? Thatd be huge," said Sparks, who helped Jantz with skull-measuring scientific work many years ago but was not involved in the new research.
As for the possible causes, he added, "We like to infer things outside of our data to try and explain a storya patternbut there is no smoking gun for what is causing these changes."
Article from: nationalgeographic.com
Red Ice Radio guests discuss skulls, crystal skulls and religion, genetic changes/manipulation, and DNA:
David Hatcher Childress - The Crystal Skulls
Lloyd Pye - The Starchild Skull
Anton Mifsud - Maltas Ancient Megalitic Temples, Giants & Traces of the Lost Atlantis
Lloyd Pye - Starchild Skull DNA, Disclosure & Directed Panspermia
Philip Coppens - The Ancient Alien Question
Nigel Kerner - The Greys, Genetic Engineering, Bloodlines, Races & DNA
Dr. Lorraine Day - Food, Health & Disease
Jeffrey Smith - Seeds of Deception & The Danger of Genetically Engineered Foods
Health and Body: The True Shape of a Mother
The Health Dangers of Energy Drinks and Supplements
Prevent the EU from restricting information communicating benefits of food and natural health products
Healthy two-headed baby born in Brazil
Could your saucepans bring on the menopause? Chemicals found around the home linked to health problems
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20-Million Year-Old Ape Skull Found in Uganda to Throw New Light on Evolution
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A skull that rewrites the history of man
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