Leonardo continues his dissections, becomes obsessed with how lips, tongues and mouths work, makes a wax model of the human brain, and wonders about the tongue of the woodpecker.

Oh dear!

This page contains Member's Only content... and you aren't logged in! Sucks to be you, seriously, because the content you are missing is really funny. And clever. And probably very, very sexy. So sign up now and your life will be improved substantially.