In the beginning...

Strange, but true: energy, if there's a lot of it, can sometimes turn into particles of matter. Every time you make matter out of energy, you also make a 'mirror image' of it called antimatter. They're almost identical - the main difference is that antimatter has an opposite electric charge.

Just after the Big Bang, there was a lot of energy, and lots of matter and antimatter being made. But for some reason we can't find much antimatter out there in the universe today.
 
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Positrons - the antiparticles to electrons - are used by doctors in positron emission tomography (PET) scans.
Positrons - the antiparticles to electrons - are used by doctors in positron emission tomography (PET) scans.
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