The following news story apparently first appeared in the Las Vegas Sun:

'A circus dwarf, nicknamed Od, died recently when he bounced sideways from a trampoline and was swallowed by a yawning hippopotamus waiting to appear in the next act. More than 1,000 spectators continued to applaud wildly until they realized the tragic mistake.'

And yet, of course, Od never existed; which doesn't stop the story appearing every few years as a news item, set in fictional circuses from Manchester to Thailand and Sydney. The hippo-eats-dwarf story is a) bizarre, b) almost certainly fake and c) masquerading as real, which describes a disturbing amount of what we hear and read about in magazines and on the web.

Scientific investigator Alex Boese, who has for ten years run the web's biggest myth-busting website www.museumofhoaxes.com, has collected together a wonderfully entertaining anthology of the best urban myths of recent years, from bonsai kittens reared in jars to keep them small to male lactation, and confirms or de-bunks them once and for all. So did Burger King really release a left-handed Whopper, with all of the condiments rotated through 180 degrees? Is dehydrated water available to buy online? Or are they just hippo-eats-dwarf urban myths?

Recognized as an expert on hoaxes by CNN and the New York Times among others, Alex Boese holds a master's degree in the history of science from the University of California, San Diego. He is the author of Elephants on Acid, a fascinating tour through the weirdest science experiments ever conducted, and is the creator and curator of www.museumofhoaxes.com, which receives over a million page hits every month. He lives in San Diego.