NASA scientists want to solve a mystery: Why did life "turn left?"

When NASA launched a spacecraft to an asteroid, scientists patiently waited for their chance to look at bits of the space rock in a laboratory, hoping it would answer some of humanity's most enduring questions. For Danny Glavin, a senior sample scientist, he wanted to solve a relentless mystery in his life's work: Why are all known living things only based on the left-handed forms of amino acids, the molecules that build proteins? His moment arrived nearly a decade later. Glavin and a