Ig Nobel awards: Wackiest science experiments feature missile-guiding pigeons, cats scaring cows

Even scientists need a laugh, after being knee-deep in data or working long hours in a lab or on important research. The annual Ig Nobel awards, handed out for surprising research that’s easy to poke fun at, is the perfect example. From training pigeons for missile guidance to scaring dairy cows with cats, it’s goofy — but its goal is to get people interested in science. Heidi Petracek on the quirky questions the winners sought to answer.