https://apnews.com/915b822d907f4b6f8e57de7b5785ed35

BERLIN (AP) — Researchers in Germany have started collecting data with a 60 million euro ($71 million) machine designed to help determine the mass of the universe's lightest particle.

Physicists, engineers and technicians at the Karlsruhe Institute of Technology hope the 200-metric ton (220-ton) device will narrow down or even pinpoint the actual mass of neutrinos. Those are sometimes called "ghost particles" because they're so difficult to detect.