The document is one of a large group of declassified documents.
About half of them survived the almost 15,000-year ordeal.
Teeth survive fossilisation better than bones, meaning they are at the forefront of evolutionary research.
Removing male hormones from sheep delays the aging process, NZ scientists have found.
The largest ancient human skull ever found might belong to a new species.
The Earth has a mysterious 'pulse' and no one knows what's causing it, a new study says.
The researchers polled nearly four thousand cat owners.
The world's only 'alpine parrot' didn't choose to live in the mountains, scientists say - it moved there to avoid us.
I noticed something was off when I took three different tests and received three different results.