Skin & Hair
Goosebumps
Raised hair follicles in response to cold or emotion.
A lot is going on. Inside you.
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Something else to wonder about
Bones & Joints
Why joints crack
A single cracking sound during rapid joint movement.
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Eyes
The stopped clock
After a rapid eye movement, the first new image seems visible for slightly longer.
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Nerves
Hiccups
An involuntary spasm of the breathing muscles followed by closure of the glottis produces the characteristic hic.
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Stranger still …
151 phenomena
EyesFloaters in vision
Threads or dots seem to move through the visual field, especially against a bright background.
BrainAn earworm
A short passage of melody continues internally without a conscious decision.
Skin & HairWrinkled fingers in water
Finger skin wrinkles after prolonged contact with water.
NoseLight-induced sneezing
Bright light can trigger sneezing in some people.
NervesSleep start
A brief muscle jerk can occur while falling asleep, sometimes with a feeling of falling.
Skin & HairDermatographism
Light scratching pressure produces temporary raised lines.