Search: 33,000-year-old dog skull found

An ancient dog skull was recently discovered in a cave in Siberia (which area?).  Scientists say the skull is some of the oldest known evidence of dog domestication (what was found in another cave?).  They say both findings suggest dogs came from more than one ancestor and from different geographic locations (how old is the world's first dog?).

 

 

Get details on the discovery of the world's oldest dinosaur nursery.

 

Find out if ancient popcorn has been discovered.