We use 21st century tech terms like hashtag, stream, and mouse with casual indifference, but how did these words get to be so commonplace in our everyday vernacular? We know the origins of Superman (kryptonite), Spider Man (radioactive spider), and Batman (rich boy’s revenge) but not “podcast,” “spam,” or even “hacker.” So I looked at 21 common tech terms that have been downloaded into our collective hardware and decoded them.