20 years ago the 1st antihydrogen atoms were made at CERN

http://imgur.com/ytmStZO

The atoms produced in 1995 remained in existence for about 40 billionths of a second, travelling for 10 metres at nearly the speed of light before being annihilated by ordinary matter and producing the signal that showed the anti-atoms had been formed. In June 2011, the ALPHA experiment at CERN reported that it had succeeded in trapping antimatter atoms for over 16 minutes. Earlier this year further advances were made when the Baryon Antibaryon Symmetry Experiment (BASE) reported the most precise comparison of the charge-to-mass ratio of the proton to that of its antimatter equivalent, the antiproton and the AEgIS experiment, which has just started operation this year, is designed specifically to measure the gravitational interaction of antimatter.