New research suggests early dinosaurs laid eggs with soft shells, and mosasaurs—gigantic marine reptiles—did so, too, laying soft-shelled eggs of massive proportions. Birds and crocodiles lay eggs ...

Imagine finding a muddy footprint and trying to figure out which dinosaur made it. It's a bit like Cinderella trying on her glass slipper... except the shoe is squishy mud, the foot weighs tons, and ...