Roger Hegarty isn't a big fan of fart jokes. But over the course of a decade studying livestock methane emissions for the New South Wales state government in Australia, he's found that few people have been able to resist sharing their favorite wind-breaking witticism. "There isn't a fart joke in the world I haven't heard," he says with good-natured weariness. He'd be thrilled not to hear any of them again, particularly considering that 95% of the gas actually issues from front end of the animal, not the rear.
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