The world’s oldest drawing might be easy for a casual observer to miss: a 38.6mm (1.52 inch) long flake of silcrete (a fine-grained cement of sand and gravel) with a few faint reddish lines drawn on ...
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In Crayon Physics, scribbles and doodles wriggle into existence. Lines become lifelines. Right angles become brackets, braces, even fulcrums. Circles trundle down slopes or link wagging elastic ropes ...
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