I think you may be confusing "problems that would have the biggest potential impact on humanity" with "problems that are hard to solve". Which is not to say that curing cancer or colonizing mars is easy. But in what way is, say, desalination harder to do than creating a search service that wants to make all information "universally accessible and useful"?
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I think you may be confusing "problems that would have the biggest potential impact on humanity" with "problems that are hard to solve". Which is not to say that curing cancer or colonizing mars is easy. But in what way is, say, desalination harder to do than creating a search service that wants to make all information "universally accessible and useful"?