One winner studied why woodpeckers do not get headaches

Welshman Howard Stapleton's device makes a high-pitched noise inaudible to adults but annoying to teenagers.

Other winners included a US-Israeli study into how a finger up the rectum cures hiccups and a report into why woodpeckers do not get headaches.

All the research is real and published in often prestigious journals.

Unlike the recipients of the more illustrious awards, Ig Nobel winners get no cash reward.

Nevertheless eight of the 10 winners this year paid their own way to receive their prizes in Cambridge, Massachusetts.

Photography

Marc Abrahams, editor of science humour magazine Annals of Improbable Research, which co-sponsors the awards, said: "The prizes are intended to celebrate the unusual, honour the imaginative - and spur people's interest in science, medicine and technology."

Real-life Nobel Laureates demonstrated winning research

This year's winners included: