Posted on 01/25/2006 8:52:48 AM PST by blam
Time changes modern human's face
By Rebecca Morelle
BBC News science reporter
Our ancestors had more prominent features but lower foreheads
Researchers have found that the shape of the human skull has changed significantly over the past 650 years.
Modern people possess less prominent features but higher foreheads than our medieval ancestors.
Writing in the British Dental Journal, the team took careful measurements of groups of skulls spanning across 30 generations.
The scientists said the differences between past and present skull shapes were "striking".
Plague victims
The team used radiographic films of skulls to record extensive measurements taken by a computer.
They looked at 30 skulls dating from the mid-14th Century. They had come from the unlucky victims of the plague. The skulls had been excavated from plague pits in the 1980s in London.
Another 54 skulls examined by the team were recovered from the wreck of the Mary Rose which sank off the south coast of England in 1545.
All the skulls were compared with 31 recent orthodontic records from the School of Dentistry in Birmingham.
"This new research shows how bones... can provide more knowledge to the scientific community, and ultimately the public"
Professor Robert Foley, Cambridge University The two principal differences discovered were that our ancestors had more prominent features, but their cranial vault - the distance measured from the eyes to the top of the skull - was smaller.
Dr Peter Rock, lead author of the study and director of orthodontistry at Birmingham University, told the BBC News website: "The astonishing finding is the increased cranial vault heights.
"The increase is very considerable. For example, the vault height of the plague skulls were 80mm, and the modern ones were 95mm - that's in the order of 20% bigger, which is really rather a lot."
He suggests that the increase in size may be due to an increase in mental capacity over the ages.
Repatriating bones
The study of human remains has previously fallen into controversy, and a report commissioned by the UK government called for human remains to be repatriated where possible.
The ancient skulls used in this study, from which the radiographic films were taken, have either been reburied or are now housed in museums.
Professor Robert Foley is director of the Leverhulme Centre for Evolutionary Studies at Cambridge University, and sat on a government working group which has drawn up guidelines on working with human remains.
"The study of human remains can provide vital information about our past. There is a huge interest in our biological past - both from an evolutionary and a historical point of view - and research into human bones can tell us a great deal," he said.
"This new research shows how bones, and even the records of bones, can provide more knowledge to the scientific community, and ultimately the public."
So tigers and lions are the same species?
A killer whale and the bottlenosed dolphin are the same species?
Okay.
YEC INTREP
Problem is , she's a Scientologist.
You have to look beyond the fact that you can mix tigers with lions and get offspring ~ we need to know what happens with the offspring's "offspring", if any.
Males are considered sterile, but females are fertile. They can and have produced offspring.
You have to look beyond the fact that you can mix tigers with lions and get offspring ~ we need to know what happens with the offspring's "offspring", if any.
It seems that you need to check the facts, and you didn't.
You'd best check your logic.
To be fair, I suppose no one ever thought of looking in London's plague pits before.
So are lions and tigers different species?
Yes or No.
Ho doubt Darwin would have thought of them as two different species. Your modern accountant or lawyer might give it a different spin. However, with "some" of the offspring being predictably infertile if crossed with the others, you have different species. This is a bit more complex than the Mule/Jenny thing, but similar.
Clintonian shuffle duly noted.
Are lions and tigers different species? Yes or No?
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Gods |
Just updating the GGG info, not sending a general distribution. |
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