Who hasn’t read an article where you have to wonder if the writer ever met the subject? Who doesn’t listen to a radio interview and beg the presenter to challenge the guest to simply answer the question? Yet, even I have resorted to using the approach taken by Deep Thought, the computer in Douglas Adams’ Hitchhikers Guide to the Galaxy, which takes 7.5 million years to compute the ultimate answer. It then spends the next 10 million years trying...