I’m tempted to say the mug, because if I didn’t have one drinking coffee would be much harder and would probably cause a lot of mess.
My honest answer would be the internet though! So easy to share ideas and information now with other people, or even just to chat with friends who live in other countries. And there are so many cat videos to watch! We live in the future!
So far, the computer. So many revolutions in many areas occur because of revolutions in how we process and deal with technology. The Reformation and Renaissance was triggered by the printing press, maybe the next revolutions are being triggered by computers and the internet.
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