Quote: Positrons (bizarro electrons) do occur in lightning bolts and occasionally show up in outer space, but they tend to annihilate one another long before they have a chance to accumulate. So physicists at the CERN (European Organization for Nuclear Research) physics laboratory near Geneva generate them, Nature reported, by "slamming a proton beam into a metal target, then dramatically slowing the emerging antiparticles so they can be used in experiments."

But it seems they are now talking about anti-protons. Some clarity would be helpful.