A patch of human skin the size of a pencil eraser carries roughly a million…
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Drawing IdeasKids
In 1839, Charles Goodyear accidentally dropped a mixture of rubber and sulfur onto a hot stove and discovered vulcanisation — the same cross-linking that now makes the rubber erasers on a child’s pencil firm enough to lift graphite without smearing it into the paper.
In January 1839, in a small workshop in Woburn, Massachusetts, Charles Goodyear dropped a lump…
