There's enough DNA in the human body to stretch from the sun to Pluto and back. But don't confuse DNA with your genes, says writer Sam Kean.
"They are sort of conflated in most people's minds today but they really are distinct things," he tells Fresh Air's Terry Gross. "Genes are like the story and DNA is the language that the story is written in."
Hundreds of Muslim athletes are participating in the London Olympics, which officially begin Friday. But along with travel and other logistics, they're also adjusting to Ramadan, the holy month that requires them to fast.
As a child, astronomer Jill Tarter would walk along the beaches of western Florida with her father and look up at the stars.
"I assumed, at that time, that along some beach on some planet, there would be a small creature walking with its dad and they would see our sun in their sky, and they might wonder whether anyone was there," she tells Fresh Air's Dave Davies. "But I never thought about it professionally until graduate school."