Science Magazine is celebrating its 125th anniversary with 125 big questions that scientists will face in the next 25 years. You can read them all for free here. For the 25 biggest questions, the editors commissioned short essays. I addressed the minor matter of how and where life began.

Fortunately, I get to ask the question. I don’t have to provide the final answer. A science writer’s prerogative.

Originally published July 1, 2005. Copyright 2005 Carl Zimmer.