Only about 2% of the world population has green eyes.
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If you're one in a million, there are about 7,234 people just like you.
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Déjà vu occurs when your brain tries to apply a memory of a past situation to your current one, fails, and makes you feel like it's happened.
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Each king in a deck of playing cards represents a great king from history: spades - King David, clubs - Alexander the Great, hearts - Charlemagne, and diamonds - Julius Caesar.
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The chills you sometimes feel when listening to music is called "musical frisson."
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A third of the human population sneezes when they look at the Sun. Light can signal the ocular nerve near the sinuses and triggers a sneeze.
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Some monks can increase their body temperature so much they can dry soaking sheets in a freezing room!
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