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Caffeine doesn't give you energy. It blocks the chemical that tells you you're tired. There's a big difference.
In 2005, Barry Marshall won the Nobel Prize for an experiment where he drank a petri dish of H. pylori bacteria to prove ulcers were caused by infection, not stress.
Fire particles at a wall with two slits. They create a wave pattern. But watch them, and the pattern disappears. Nobody fully knows why.