On May 3, 1967, Dr. Timothy Leary , that high priest of hallucinogens, faced off in a debate with MIT professor Dr. Jerome Lettvin about LSD in MIT’s Kresge Auditorium . Leary spent the debate in the lotus position, dressed in a white gown, beads and bare feet. The very picture of a counter culture icon. Lettvin, on the other hand, cuts a distinctly conservative figure, sporting a short-sleeved white shirt, a skinny tie and thick-framed glasses. On first blush, the debate might look like a stereotypical clash between the hip versus the square, but it ended up being much more interesting than that. Lettvin, who proved to be at least as charismatic as Leary, more than held his own against the man Richard Nixon once called “the most dangerous man in American.” You can watch the full debate above . Leary speaks for the first half of the video. For those familiar with his routine, little of what you see will come as a surprise. He argues that...