Scientists have generated human stem cell models which contain notochord -- a tissue in the developing embryo that acts like a navigation system, directing cells where to build the spine and nervous ...

A Ukrainian official said Kyiv was responsible for the assassination in Moscow of Gen. Igor Kirillov, the chief of Russia’s radioactive, chemical and biological defense forces. By Anton ...

So how did we become such a unique animal? Human intelligence was born in the Great Rift Valley of East Africa, as our ape ancestors evolved increasingly bigger brains. That may only have happened ...