Scientists in China are building the world's largest"ghost particle" detector 11,500 feet beneath the surface of the ocean.
Related: Ghostly neutrino particles are blasting out of a nearby galaxy, and scientists aren't sure why Despite their ubiquity, their minimal interactions with other matter make neutrinos incredibly difficult to detect. They were first discovered zipping out of a nuclear reactor in 1956, and many neutrino-detection experiments have spotted the steady bombardment of the particles sent to us from the sun; but this cascade masks rarer neutrinos produced when cosmic rays, whose sources remain mysterious, strike Earth's atmosphere.