They suck your blood, hitch-hike on your luggage, and are a growing threat to the hotel industry. Bedbugs are a growing problem in the modern jet-set world, and scientists are using genetic techniques to try and understand why. Feeling itchy yet? Plus, we look at the genetics of some other annoying insects, get to the bottom of the recent controversy about junk DNA, and our gene of the month is none other than Superman and his weedier alter-ego Clark Kent.