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Humans actually glow in the dark, just too faintly to see.

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Title Skin Surface (Human) Description A scanning electron micrograph of the surface of human skin. Topics/Categories Anatomy -- Skin Cells or Tissue -- Abnormal Cells or Tissue Type B&W, Photo Source National Cancer Institute
Human Body

Glow

Humans actually glow in the dark, just too faintly to see.

Human bodies emit extremely faint light associated with biochemical reactions, but it is far too weak to see with unaided eyes. This ultraweak photon emission is different from the infrared radiation detected by thermal cameras.

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Human Skeleton on Exhibit at The Museum of Osteology, Oklahoma City, Oklahoma.
Human Body

300

Babies are born with about 300 bones, but adults have only 206.

Babies have more separate skeletal pieces than adults, often described as about 300 bones compared with the usual adult count of 206. The newborn number is approximate because developing bone and cartilage are not always counted the same way.

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zh:尖沙咀香港科學館2010年7月, zh:骨骼展覽
Human Body

1 cm

You are about a centimeter taller in the morning than at night.

People are usually slightly taller after a night lying down because spinal discs regain fluid when unloaded. Around a centimeter is a useful rough illustration, not a fixed daily change for everyone.

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