We’ve seen particles that are massless only in one direction

Strange particles that have mass when shifting one direction however no mass when shifting in one other have been first theorised greater than a decade in the past. Now, these mass-shifting particles have been glimpsed in a semimetal uncovered to excessive situations.

“This [particle] is very bizarre. You can imagine walking on the streets of New York and if you go straight, you are super light, you are massless. But turn 90 degrees east or west, and you become super massive,” says …