the.com/handedness
your brain picked a favorite hand before you learned to pick anything else.
means the consistent preference for using one hand over the other for skilled tasks, wired by brain lateralization rather than habit alone.
from from old english hond plus -ness, but the science starts with paul broca in the 1860s tracing language to the brain's left hemisphere, the same side that usually bosses the right hand around.
global splitabout 90 percent right-handed, remarkably stable across history
in utero cluefetuses show thumb-sucking preference by 15 weeks
not just handscorrelates with foot, eye, and even ear preference
twin puzzleidentical twins can still end up opposite-handed