It's a big day for particle physics! Scientists at CERN believe they have found a fundamental building block of our universe: the elusive Higgs boson.
You may know it by another name. It's also called the "God particle."
Today's announcement is just a preliminary result, though scientists say it is "very strong."
But what exactly is the Higgs boson... And why do we care about it?
Scientists believe it is the particle that gives all matter its mass. Finding it would fill a huge hole in the Standard Model of physics. That theory explains how our universe works.