During the last several years, our TRAP collaboration has pioneered te
chniques for slowing, trapping, cooling and indefinitely storing antip
rotons to energies more than 10(10) times lower than previously possib
le. The radio signal from a single trapped antiproton is now being use
d for precision measurements. Many cold antiprotons are ''stacked'' as
another important step toward the eventual production of antihydrogen
, and positrons have been trapped in vacuum.