Plural of hemisphere; either of the two halves of Earth divided by the equator, or the two halves of the brain divided by the longitudinal fissure.
From Latin 'hemisphaerium,' combining Greek 'hemi-' (half) and Latin 'sphaera' (sphere), a term used since the 1600s for geographical and anatomical divisions.
Your brain's hemispheres are weirdly crossed—your left hemisphere controls your right side and vice versa! This discovery amazed neuroscientists in the 1800s and revolutionized how we understand brain function.
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