Humans are not good at general purpose computation. Your linked article states the brain achieves 1 exaflops, and cites http://people.uwplatt.edu/~yangq/csse411/csse411-materials/s... for this number. That document states the value with no citation or rationale.

I can do far less than 0.0001 single precision floating point operations per second, so whatever the context for "1 exaflops" is, it isn't general purpose computation.

EDIT: this seems sort of like saying that throwing a brick through a window achieves many exaflops because simulating the physics in real time would require that performance. I'd like to read more about this value and how someone came up with it, but googling just gives me that same scienceabc article and stuff referencing it.

Nahh, you could do more than 0.0001 floating point operations per second. To beat that you need to do a single floating point operation in two hours, which is quite achievable with paper and pencil ;-)

0.01 floating point operations per second seems harder, but perhaps humanly doable.

I'm easily distracted.