Whose Fish?

I did..took me like 10 minutes to work everythning out, but I got it

Way too easy if you have a piece of paper and a pencil.

Why Einstein said only 2% of the world's population could do it we'll never know. Surely a lot more can.

Perhaps in his time, people were not as well educated?

Or maybe.. that 2% of the population has migrated to the internet forums, mainly this one.