Knowledge as a unit

Input interpretation:
Estimated information content of all human knowledge

Value:
~~ 0.01 ZiB (zebibytes)
~~ 10 EiB (exbibytes)
~~ 10 EB (exabytes)
~~ 1×10^19 bytes
~~ 1×10^20 bits

Comparisons:
~~ 100 x estimated data content of the deep web (~~ 91 000 TB)
~~ 6000 x identifiable storage capacity of the human brain (~~ 2 PB)
~~ 6000 x approximate data content of the Internet Archive Wayback Machine as of 2006 (~~ 2 PB)

I am usually just pointing out the results of searching with WolframAlpha, but sometimes the information is mind-blowing: all the informational content of human knowledge is similar with the storage capacity of 6000 human brains!