Human Body feed
~1 million
Each kidney contains roughly a million nephrons: microscopic working units that filter blood, recover useful substances, and help adjust the composition of the fluid eventually excreted as urine. The number is an approximate anatomical description, not a count shared by every person.
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.