When Matter and Anti-Matter Meet | Do they always annihilate?

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Mesons are bound states of matter and anti-matter
0:00 Intro
0:45 Bound states
1:38 Mesons
5:06 Application : Why do we care?
7:35 Conclusion
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When positronium decays, it's not just 2 or 3 photons; in rare cases it can be a higher number, but always odd or even depending on the spin state. Speaking of which, you never mentioned their names, ortho- and para-positronium, and (relevent to your video) how their decay time is so different.

JohnDlugosz