Painting cows to look like zebras, Planet Nine could be a black hole and prehistoric humans used bones like soup cans!
Are insects being wiped out? Does the risk of mosquito-borne illness increase during floods? Why do we sleep so deeply when sick? And how does our gut bacteria affect our mental health?
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!