An experiment at @Fermilab measured excessive wobbling by particles called muons. In this month's cover story, physicist @MArcelaCArena says this odd finding could mean there is a fifth force of nature.

Read our October issue to learn more: https://t.co/4OScQ1bPOw pic.twitter.com/os4VTZFg5L

— Scientific American (@sciam) September 16, 2021