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The simplest way
to describe antimatter is in terms of its behaviour - when particle and
antiparticle meet they annihilate and their mass is turned into energy in the
form of g-rays, also called photons.
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This process is
governed by the second and last equation you will see this evening, and
surely known to the whole audience - Einstein’s famous equation E=mc2.
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Not only is this
true for electrons and positrons, it also occurs for quarks and anti-quarks
and more complicated objects like protons and anti-protons. You would also be
in trouble if you met your anti-you.
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However this
possibility is still someway off; it was not until 1996 that anti-hydrogen,
the simplest anti-atom was produced.
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