4 improbable things that the laws of physics can enable Einstein's general theory of relativity is known for predicting wormholes, which are time-traveling shortcuts that link various regions of space and time. Nobody has ever seen one, and whether you could fly down one even if they did exist is a point of contention. As we wait for a visitor from the future to inform us, consider the following physical impossibilities. MATTER MARRIED WITH ANTI-MATTER Normally, when matter collides with its antimatter counterpart, both “annihilate” in a burst of energy. It's just as well that we exist in a world of so much matter and so little antimatter. Strangely enough, certain matter can even be antimatter. Majorana fermions will be their own antiparticles, capable of annihilating themselves in the right circumstances. Physicists have long speculated that neutrinos fit into this category, but demonstrating it would require observing some of the universe's rarest processes in motion, ...
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