PBS
Why Wasn't There A Second Age of Reptiles?
An asteroid impact triggered the K-Pg mass extinction, wiping out the non-avian dinosaurs, ending the Age of Reptiles, and ushering in the Age of Mammals. But why was it the mammals who triumphed?
Next Animation Studio
NASA discovers three things that impact Earth's spin
There are three reasons why our planet wobbles: glacial rebound, melting of ice, and mantle convection, according to a study published in the journal Earth and Planetary Science Letters.