[sgtnoodle]

A lot of problems worth solving have a long tail of 9's to chase down, i.e. 99.999%

Self driving cars is one of those projects.

[thaumasiotes]

It's not so much that high-value problems have a long tail to chase down.

All problems are like that; the difference for high-value problems is that working on the tail is worth doing, because the problem is high-value.