A new paper proposes two experiments to test if the steadiest components in physics are really kind of shifty after all.
For the first time, researchers have shown that antimatter interferes as a quantum wave in the same way regular matter does.
New findings suggest that ordinary sound has negative gravitational mass.
Both can be made using the power of particle accelerators.
Mysterious dark matter particles may be blowing past Earth at 1.8 million kilometers per hour.
The technique could help scientists better understand why certain materials have the properties they do.