[l33tman]

The optical nerve has an information density of around 10 MBit/s (ref https://pmc.ncbi.nlm.nih.gov/articles/PMC1564115/) Concentrating on only the symbolic thinking speed seems to be unnecessarily restrictive..

[a_wild_dandan]

An additional citation substantiating that 10 MB/s figure: the 3rd sentence of TFA.

[nabla9]

The only limit is the max size of Hacker News title allows. :)