In the early 1990s, Chinese-American physicist Ning Li published a series of controversial papers theorizing about anti-gravity. In 2001, she received a Defense Department contract to fund experimental efforts based on her theories… And in 2004, Ning Li disappeared — prompting a flood of conspiracy theories. Let’s dive into the work of Ning Li and the mystery surrounding her disappearance to see which parts of this story we can finally put to rest for good.