Last night, we watched the final episode of Cosmos: A Spacetime Odyssey. The series ended as it started, with a nod to individual scientific achievers but a focus on the ability of every inquisitive ...

On this week's Cosmos: A Spacetime Odyssey, Neil deGrasse Tyson looked at how we know that the earth is 4.5 billion years old. It's an interesting story, but not quite as interesting as what that ...