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Kinds

What sort of thing it is: a trick you can do, something that happens to you, something your brain makes up, and so on.

• Trick 27 Things some people can do on command. Some are learnable; others appear to be innate. Ambidexterity · Cloverleaf tongue · Crossing your eyes
• Involuntary 29 Things that happen to you, sometimes frighteningly, that are benign or very common. ASMR · Benign fasciculations · BPPV
• Perception 25 Things your senses and brain construct that are not out there, or are more real than you think. Afterimages · Alice in Wonderland syndrome · Blue arcs of the retina
• Sound 8 Noises the body makes or that you hear from inside it. Autophony · Ear clicking when swallowing · Hiccups
• Variation 21 Normal structural differences between human bodies. Accessory ossicles · Attached and free earlobes · Bifid uvula
• Reflex 17 Automatic responses that run without asking you. Accommodation reflex · Babinski reflex · Blushing
• Rare ability 13 Abilities and conditions that very few people have. CCR5-delta32 · Chimerism · Congenital insensitivity to pain