Comments on: Stone tools give clearer picture of ancient Americans

By: lambsev

lambsev — Mon, 16 Jul 2012 14:10:54 +0000

Really! I like to know more, can you give me a link?

By: lambsev

lambsev — Mon, 16 Jul 2012 14:10:03 +0000

What pressure?

By: Steve03

Steve03 — Sat, 14 Jul 2012 15:53:53 +0000

Because the pressure keeps it heated . . .

By: Frank Norton

Frank Norton — Sat, 14 Jul 2012 04:49:04 +0000

Stone tools were made by the Homo habilis over 1.8 million years ago in the Great Rift Valley in Southern Africa, choppers and stone hand axes. Also by the Homo Erectus 400,000 years ago, and stone projectles by the Neanderthal up to some 29,000 years ago, plus Cro-Mangnon made stone medical tools that are 20,000 years old. Then there are the American Indian arrowheads found all over America made of obsidian, mica, stone and bone. There is over 1.8 million years of evolution of the tool technology.

By: Michael G.

Michael G. — Sat, 14 Jul 2012 00:17:57 +0000

Carbon dating is good to around 1,600 years ago. Then you need to use something else for dating.

By: Annie

Annie — Fri, 13 Jul 2012 22:34:18 +0000

What are you voting on, a clown???? I don't know to vote on!!!!!!!!!!!

By: @lambsev11

@lambsev11 — Fri, 13 Jul 2012 17:35:19 +0000

OK enough on carbon dating, it is a complex subject, but let me ask: If the earth is billions of years old, why has it's core not cooled to the temperature of it's crust?

By: eVERMYRTLE

eVERMYRTLE — Fri, 13 Jul 2012 17:31:24 +0000

O. K.

By: Chris

Chris — Fri, 13 Jul 2012 17:10:58 +0000

DNA can help because modifications occur at a certain rate. Humans do not replicate like fruit flies.