Today's "Underappreciated Technology of the Day"
Via the invention of affordable, mass produced nails about 200 years ago, all people everywhere have been able to hang photgraphs on their walls for as long as photography has existed. Thus one could say that nails are an essential part of the photography technology system. If I were a nail enthusiast, I might even try to convince you that nails where the technological "tipping point" that made photography possible.
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