You can’t weigh the universe’s smallest particles on a bathroom scale. But in a clever new experiment, physicists have found that one such particle—the proton—is lighter than previously thought.
“It’s a significant improvement on the mass of the proton,” says Edmund Myers, a physicist at Florida State University in Tallahassee who wasn’t involved with the work. “I can’t see any holes in what they’ve done. They’ve done a good job.”
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