Bell Helicopter’s prototype for the AH-1G Cobra flies in front of two UH-1 Hueys, the aircraft it was designed to protect. What was on Mike Folse’s drawing board at Bell Helicopter that day in ...

Dinosaur eggs! Credit: Sergio Dionisio/Getty Images While live birth has evolved many times in mammals and diverse groups of lizards and snakes, scientists had not yet observed live birth among ...