Ask HN: What are other underrated crazy ideas?

[danicgross]

Given the “crazy ideas” success on the Suez Canal situation, I thought I’d try the same question, but more broadly —-

What are under-investigated, important, outlandish, or fringe ideas that are worthy of attention?

[throwawaybutwhy]

Solar geoengineering [0]

[0] https://news.ycombinator.com/item?id=26588364

[poormystic]

So you're asking, which stupid seeming ideas are really brilliant but misunderstood. Yes an important question. ;)

[ignoranceprior]

Cryonics