It’s been 20 years since the birth of Dolly the Sheep, the first mammal to be cloned from an adult. Because Dolly died prematurely, scientists have worried that cloning accelerates the aging process. But a new analysis of 13 cloned sheep—including a batch of Dolly’s genetic duplicates—shows this isn’t the case.
NASA’s Pluto flyby is a truly international event, not limited by borders: the excitement and commentary span the planet. But this phenomenon isn’t new. What’s the first giant, global science story you remember?