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When I was a kid, I had to reference several manuals and carefully assemble a double handful of parts in specific order to connect two computers to eachother. I'd have to fiddle with protocols and speeds and obscure features and traits to make the stars align. Transferring 200mb would be an overnight task. If I wanted to show pictures from my vacation on a big screen, I would have to have them printed on cellulose and insert them in tiny frames to project on a thick screen with a huge machine.
Yesterday, I went to a friend, pointed my phone at a ~~magic symbol~~qr code and sent a full movie to their PC in a few minutes. Then I pushed a button to make the photographs on my phone appear on their TV.