Mark was truly the most spectacular speaker we've had in years. He's warm and unpretentious, and very very funny, especially when he's describing the neural circuits of the brain. He can take the most complex topics in science and turn them into an entertainer's delight. He also brings fabulous animated videos and unusual audio recordings, all of which kept the workshop exciting. Make sure you ask him to bring Mildred the Cauliflower--she really knows her stuff!