In science fiction,

Newsweek, October, 2007

if matter meets antimatter, the result is mutual annihilation, and usually the end of the universe. Scientists at the University of California, writing in the journal Nature, recently managed to get an electron and a positron (an anti-electron) to stick together in a weird hybrid atom. It only lasted 60 billionths of a second before falling apart; then the two particles annihilated each other. Don’t worry, though. The scientists insist that the universe is safe.–P.F.

Patrick Falby