When I'm writing fiction I'm thinking, God, this is so hard - I have to make all this stuff up! I wish I were writing a nonfiction book where all the facts are laid out and I don't have to be so much at sea.
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You need virtual reality to understand high level science or high level math. It's very helpful to explain third and fourth dimensional things that people are constantly addressing in quantum physics. But, as soon as you're creating an avatar, and you can live and you can start to feel sensations on VR, that has gone too far.
There are lots of retailers that are now scrambling to emulate the Amazon model, so Amazon does not have a monopoly on same-day distribution or broad selection or low prices. All that said, there are advantages that accrue to the largest player, so I don't see much in the way of Amazon slowing down.