Dirac's Plate Trick, the Hairy Ball Theorem and more: Research probes physics of irregular objects on inclined planes
How gravity causes a perfectly spherical ball to roll down an inclined plane is part of the elementary school physics canon.
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Why modern humans have smaller faces than Neanderthals and chimpanzees
Modern humans have uniquely small and flat faces, especially compared with our Neanderthal cousins' notoriously robust faces ...