Just the right planet, in just the right solar system, in just the right spot in just the right galaxy.

First, the planet would have to be a rocky, terrestrial planet. Gas giants, such as Jupiter, generally contain…

Humanity can split an atom, send rovers to Mars, send data around the world in seconds, and use jellyfish genes to make lab rats glow. We’ve cloned animals and sequenced the human genome. But the cure for cancer continues to elude us. Why?