We recently gave you a list of 25 trends that would be making people billions. Most of the phenomena will end up benefiting everyone.
But if you fancied yourself as someone who could be turned into a billionaire, you were arguably cheating — these were things everyone has already figured out.
The real challenge, and the greater value and more lucrative pursuit, would be to come up with the solutions to problems that have befuddled engineers for decades or more.
We thought of 10 of them:
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