Rookies

Decades ago, it was common wisdom that the Hunt Brothers could not go broke if they threw away hundred dollar bills as fast as they could pick them up and toss them. It was thought to be an NP-Hard problem. But the Hunt Brothers did figure out how to do it.

Uniquity IV

The biggest obstacle for general artificial intelligence (GAI), where machines can actually learn from external stimulus, is that humanity is networked imperfectly but is unique in each of its nodes.  Humanity is a giant, fallible information system.  It is difficult to see something like this because of its scale.