Stella posted another challenge:

This is not actually as complicated as it looks. You have to find the forms that are plotted by the funtions.

The following link shows what is meant:

http://www.xamuel.com/inverse-graphing-calculator.php?phrase=snahrevelc

The solution references the "Clever Hans" hoax.

Stella told us not to reverse it, so we allready have the solution.

Solution redirects to 

http://www.ancientsocieties.com/client-157-14/