In 2005, John Ioannidis, a professor of medicine at Stanford University, published a paper, “Why most published research findings are false,” mathematically showing that a huge number of published papers must be incorrect. Researchers have recreated prominent studies from several scientific fields and come up with wildly different results. Martin Hagger, psychology professor at Curtin University in Australia, led researchers from 24 labs in trying to recreate a key effect, but found nothing.