Tim Adams was interviewing James Watson one day when he innocently remarked upon the "perfect simplicity" of Watson/Crick's revelation of the genetic code.

Watson decided to have a bit of fun. "If it's so simple, perhaps you'd explain it to me," he said.

Could you do it? Or explain why the sky is blue, what happens to salt when you add water, or even name the Second Law of Thermodynamics? (Hint: It's like a teenager.)

Be sure to take the quiz.