Antimatter hedgehogs are, as the name suggests, beings that annihilate when they meet normal matter hedgehogs. The result is a swarm of high-energy photons, neutrinos and one spine flying off in a random direction -- antimatter hedgehogs have (for reasons unknown) one spine more than normal matter hedgehogs and thus violate C-symmetry. There is currently a big project underway, searching for additional symmetries to restore (theoretical) order to hedgehog nature. Of course, the hedgehogs themselves do not care about that... Do you?
Jokes aside, I've been away from physics for a few years, but have finally decided to go for a master next year. For me, physics is a way of thinking, a way of living, which you cannot get away from even when you are doing other things.
I still have so much left to learn though, which makes it all the more exciting.
See you on the forum!