the.com/arm
a two-pound lever that turned humanity into the planet's only species that throws for fun
means the upper limb of the human body, running from the shoulder to the hand, used for reaching, holding, and throwing.
from From Old English 'earm,' the limb, which traces back to Proto-Germanic 'armaz' and ultimately a Proto-Indo-European root '*ar-' meaning 'to fit together' or 'join' — the same family that gave Latin 'armus' (shoulder) and 'arma' (weapons, things fitted to the hand). So the limb and the weapon it wields are distant cousins, both named for the idea of things that join and fit. Note this is a different word from 'arm' meaning 'to equip with weapons,' which came later through French from that Latin 'arma.'
- bone count
- three bones from shoulder to wrist
- throwing edge
- humans throw faster than any other animal
- funny bone
- that zing is a pinched nerve, not bone
- reach
- arm span roughly equals total height
- muscle teamwork
- biceps and triceps work as opposing pairs
robocop's right arm — robocop (1987): the hydraulic cannon arm that fires projectiles from his prosthetic limb