The Ig Nobel Prizes honour achievements that first make us laugh, then make us think. We take a look at this year’s winners: from rats in pants to collecting flies!

People prefer pain over boredom, mantis shrimps can see in UV, and plants can hear caterpillars. One species of lichen is actually 126, there’s less plastic in the ocean than there should be, and Ukrainian astronomers take a stab at Vladimir Putin.