Leonardo was a man, who had a craving for yams

“One of us spent years as an Oxford tutor and it was his habit to choose controversial topics for the students’ weekly essays. They were required to go to the library, read about both sides of an argument, give a fair account of both, and then come to a balanced judgment in their essay. The call for balance, by the way, was always tempered by the maxim, ‘When two opposite points of view are expressed with equal intensity, the truth does not necessarily lie exactly half way between. It is possible for one side simply to be wrong.'”