Fossils of human ancestors are rare. You could pile all the ones that scientists have found in the back of a pickup truck.
But a remarkable site in Georgia, in the former Soviet Union, has produced a rich group of bones dating back almost 2 million years — and the discovery is shaking the family tree of human evolution.
The fossil hunters found the cache of bones more than a decade ago in a place called Dmanisi, but kept most of the find under wraps.
Now, they've lifted the veil, revealing the fossilized remains of five creatures who lived 1.8 million years ago.