About 270 bones at birth, a bone shaped like a stirrup, and nails that grow at different speeds.
Babies have about 270 bones. Some fuse together, leaving adults with about 206.
“It is composed of around 270 bones at birth – this total decreases to around 206 bones by adulthood after some bones fuse together, not counting accessory bones.”
Source: Human skeleton, Wikipedia. Checked 2026-10-31.
The smallest bone in your body is the stapes, in your middle ear.
“The stapes is the smallest and lightest bone in the human body, and is so called because of its resemblance to a stirrup (Latin: stapes).”
Source: Stapes, Wikipedia. Checked 2026-10-31.
The thigh bone (femur) is the longest bone in the human body.
“The femur is the only bone in the upper leg and the longest bone in the human body.”
Source: Femur, Wikipedia. Checked 2026-10-31.
Tooth enamel is the hardest substance in the human body.
“Enamel is the hardest substance in the human body and contains the highest percentage of minerals (at 96%), with water and organic material composing the rest.”
Source: Tooth enamel, Wikipedia. Checked 2026-10-31.
A healthy cornea has no blood vessels.
“Because transparency is of prime importance, the healthy cornea does not have or need blood vessels within it.”
Source: Cornea, Wikipedia. Checked 2026-10-31.
Fingernails grow up to four times faster than toenails.
“fingernails grow up to four times faster than toenails.”
Source: Nail (anatomy), Wikipedia. Checked 2026-10-31.
Goosebumps may be a leftover reflex from our furrier ancestors.
“The formation of goose bumps in humans under stress is considered by some to be a vestigial reflex”
Source: Goose bumps, Wikipedia. Checked 2026-10-31.
Your brain uses up to 20% of your body's energy, more than any other organ.
“The brain consumes up to 20% of the energy used by the human body, more than any other organ.”
Source: Human brain, Wikipedia. Checked 2026-10-31.
Mature red blood cells have no nucleus.
“Red blood cells in mammals are anucleate when mature, meaning that they lack a cell nucleus.”
Source: Red blood cell, Wikipedia. Checked 2026-10-31.
The small intestine can be anywhere from about 3 to 10.5 metres long.
“The length of the small intestine can vary greatly, from as short as 3 metres (10 feet) to as long as 10.5 m”
Source: Small intestine, Wikipedia. Checked 2026-10-31.