[flohofwoe]

Both of these are by far not as important as sanitation, cheap food and affordable housing.

There is a big achievement in the 20th century, which is that the time-barrier has been slashed for spreading information, and that spreading information has become cheap. IMHO this is the biggest thing since the invention of writing (== communication over large distances) and the invention of printing (== cheap mass reproduction of information, but you still had to physically transport it around the world). The internet goes hand in hand with cheap personal communication devices, I give you that. It's a shame that it is mostly used for shopping and looking at cat images ;)