On Sunday afternoon — at 2:15 pm Eastern time, to be exact — a small asteroid will whiz by the Earth. Don't worry: it'll miss us by about 25,000 miles. To be clear, there is zero chance it can hit us. This is certain. But in the long-term, worrying a little about asteroids isn't an unreasonable idea. Now, the odds of a massively destructive asteroid impact at any given time are tiny — but the potential costs would be enormous. Yet we still haven't invested in all the infrastructure needed to spot small asteroids with much warning (we spotted this...