3/9: "Lucy" artist's reconstruction
 

http://cellar.org/2002/prehuman.jpg

This is "Lucy", based on the famous Ethiopian discovery found by archaeologist Leakey. This week the Brit science journal <i>Nature</i> published details of an analysis which promises to tell us much more about human evolution. It tells us that modern traits of humans first showed up in Africa 130,000 years ago, and then expanded outside of Africa about 90,000 years ago. It also tells us that the original line evolved and did not go extinct.

I wish I knew more but <i>Nature</i> wants $25 to read the damn article... proving that evolution has officially stopped.

is this based on an artists rendering? or did they actually take the time to reconstruct the skull and use forensic artists to build the face?

narkosys

I don't know! The rendering came from the French Yahoo News so even the French translation wasn't any help.

Somewhere around here I have an australopithecus (sp??) reconstruction of a face only, and it is the creepiest thing you'd ever want to see. If I can find it, I'll make it tomorrow's IotD.

OK, it's Homo Erectus that I have the reconstruction of, and it WILL be tomorrow's image.

Homo Erectus again?

A better one. Just you wait.

Homo sapiens did evolve around 120,000 years ago, but Australopithecus afarensis (Lucy) is actually 3.2 million years old.

Lucy was very controversial because the discovery basically proved that hominines walked upright as far back as 3.2 million years ago. Her brain was not much bigger than a chimp's. So, basically, we evolved our upright stance long before we evolved intelligence.

Well, today we have 'Lucy erectus'. Is tomorrow's IotD going to be 'Desi erectus'? :p

Here's an actual pic of Lucy; about 40% of the skeleton was recovered.



http://comp.uark.edu/~dmorton/images/misc/lucy.jpg

Check out the femur.. see how it's angled towards the center of the body? That helps the hominid keep it's balance when standing. You can tell an amazing amount of things from just a few bones.

This pic is kind of a hodgepodge of different clues to bipedality.

http://www.devbio.com/chap12/1207fig2.gif

The coolest part of it all I think are the hipbones. Check this out.

http://www.devbio.com/chap12/1207fig3.gif

In order for humans to retain their center of balance when standing, they have to have a small birth canal. This forces babies to be born much earlier than normal so the head will be able to fit through the pelvis.

So, since human babies have only a very small percentage of their brains when born, they are completely helpless when born. This results in extremely long maturation rates compared to other animals. Also, since the baby is out of it's womb, it's brain is subjected to constant stimulus while growing -- resulting in higher intelligence. Not to mention the fact that the brain is now free to grow to be as large as it needs to be.

juju2112...
 

Do you work for the fucking Discover Channel?

lol... no, I just happen to be in a human evolution class this semester. :]

But anyways... I think it's cool. If it weren't for us standing upright, we probably never would have developed intelligence.

It is a well known fact that human males lose most brain function while in a reclined position, especially when there are reclining females in proximity.

An interesting fact is that the human brain has a fixed number of neuron cells... So the difference between a baby's brain and an adult's is not structural.

Actually, when you get older your brain cells start dying. So an average baby has a bigger number of neuron cells than an average adult.

I thought our 9-month cycle was actually longer than other animals.

Well, I think he means developmentally earlier. Pull a kitten out of its mom and it'll be walking around and functional within a few weeks. Pull a human baby out of its mom and it's just a little eating/shitting machine for the first few years!

'Course, I shouldn't presume to speak for him ....