Comedian Dana Eagle (@DanaEagleTweets) joins Matt and Andy to discuss the latest on Desert Tony's health, the world's oldest computer, mechanical gears found in nature, sea slugs that survive self-decapitation, a change of heart from a former head/body transplant candidate and Dana's book How To Be Depressed. This episode is brought to you by The Great Courses Plus, offering Probably Science listeners a free trial with unlimited access PLUS $30 off when you sign up for an annual plan by visiting TheGreatCoursesPlus.com/probably