For as long as humans have been using tools, they have found creative ways to mechanically fasten different materials with ropes, pegs, and wedges. After about a few thousand years of perfecting the art of fastening, someone invented the first adhesive: some birch-bark tar that could bond rocks together. The portfolio of available adhesives has since evolved into a textbook of everything from pressure sensitive adhesive (PSA) tapes to structural-strength curing adhesives.
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