They came, they went, and now they're back
Not all technologies are invented at the right time.
Leonardo Da Vinci came up with the basic idea for helicopters back in 1480, but it took until 1942 for helicopters to become mass-produced.
More recently we've seen lots of perfectly good ideas launched long before they're ready, only for other firms to bring them back when the conditions are more favourable. These are our favourite last big next big things.
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