Human Evolution

human evolution

Not the oldest hominid

At 4.4 million years old, Ardipithecus ramidus is not the oldest known hominid. In 2002, scientists announced they had discovered a hominid skull from the Sahel region of Chad. Named Sahelanthropus tchadensis, the species dates to about 7 million years ago. And a few years earlier, scientists had announced the discovery of several hominid fossils, including a thigh bone, in Kenya that dated to about 6 million years ago. They named the species Orrorin tugenensis.

01 Oct 2009

It's all in the wrist: Humans lack a knuckle-walking ancestor

Though counterintuitive, scientists have turned their attention away from the feet and to the wrist and forearm to better understand how humans evolved upright walking, or bipedalism. African apes are humans’ closest living relatives, and because these apes knuckle-walk, some paleoanthropologists have suggested that African apes and humans share a knuckle-walking ancestor. A new study, however, reveals that lumping the locomotion of all African apes together is a mistake: Knuckle-walking may have evolved more than once in the ape lineage.

01 Oct 2009

Before Lucy: Older hominid Ardi challenges thinking about human evolution

Lucy, the 3.2-million-year-old Australopithecus afarensis fossil, has long been the poster child for early human evolution. But now she’ll have to share the spotlight with an even older hominid. After spending the last 15 years studying an ancient hominid species about the size of a chimpanzee, scientists revealed details about the 4.4-million-year-old Ardipithecus ramidus in a press conference today.

01 Oct 2009

"Missing link" or major hype?

A squirrel-sized primate that lived 47 million years ago in the rainforests of Europe may be the common ancestor of monkeys, apes and humans, according to scientists who announced the discovery of the “missing link” fossil yesterday at a press conference. The well-preserved fossil has been at the center of a whirlwind PR blitz, including a History Channel documentary airing next week and an upcoming book — yet some scientists say the bones don’t live up to the hype.

20 May 2009

Running into the brick wall of Creationism again

I had recently moved to a new community and begun a new job. One night I was dining with some potential new friends. Upon learning that I am both a Christian and a passionate student of geology, one of my dinner mates proclaimed, “So, I suppose you believe in evolution, right? Well, I need to let you know that I HATE evolution.” I somehow managed to keep my cool. “And exactly why do you hate evolution?” I queried. “My minister has taught us that it is false Christian teaching,” she retorted. By that time, I could not hold myself back.

31 Mar 2009

Texas Board of Education votes to strike amendment questioning evolution

Blogging on EARTH

Evolution will still be taught in Texas. After months of proposed amendments, statements by special interest groups and lengthy debate, the Texas Board of Education voted 8-7 today to strike language from its curriculum that required students to “analyze and evaluate the sufficiency or insufficiency” of common ancestry, a major tenant of the theory of evolution.

27 Mar 2009

Homo erectus footprints show modern way of walking

In the Great Rift Valley in northern Kenya, researchers have discovered a cluster of footprints that look almost exactly like those you or I might leave on a sandy beach. These prints, however, were left by early hominins more than 1.5 million years ago, making them the oldest known evidence of fully modern bipedalism.

26 Feb 2009

Games: In Spore, cells divide and conquer

I’m no evolutionary biologist, but I’m pretty sure that you can’t just add a horn or an extra ear to your own body whenever you feel like you need a leg up on the competition, so to speak.

25 Sep 2008

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