"Discover a 2,000-year-old experiment that proves the Earth is round! Learn how shadows, the equinox, and Eratosthenes’ ancient method reveal our planet’s curvature — all with just an index card and paperclips. Perfect for science lovers and curious minds!" <br /><br /><br />#RoundEarth #ScienceExperiment #Eratosthenes #Equinox #NoShadowDay #FlatEarthDebunked #STEMLearning #FunScience #EducationalVideo #PhysicsExperiment
