Human Body feed
Capillaries
A commonly repeated estimate puts an adult's total blood-vessel length near 100,000 kilometers, enough for about two and a half trips around Earth. Treat this as a rough illustrative estimate, not a directly measured total or a universal value for every body.
300
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.
1 cm
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.