Paleontologists excavating a 62.2-million-year-old rock layer in Egypt have uncovered a petrified aquarium. The unexpected cache of fossilized fish—containing about 500 specimens from more than 20 types of ray-finned fish—offers a tantalizing look at how sea life bounced back from the asteroid impact that brought the Cretaceous to a crashing, fiery finale. Learn more about this unexpected discovery: https://on.natgeo.com/0XZjvC