This is a natural mould. If water rich in minerals fills this space, crystals can form and create a fossil in the shape of the original bone or shell, known as a cast fossil. Or sediment can fill the ...

For everyone who's still figuring it out.

A cast of Bucky, a well-preserved, subadult Tyrannosaurus rex skeleton named after rodeo cowboy Bucky Derflinger, who discovered the fossil in 1998 in South Dakota, went on display Wednesday in ...

Shuttering the department completely requires an act of Congress, and Trump lacks the votes for that. The order is designed to leave school policy almost entirely in the hands of states and local ...