Season 2, Episode 13
Topics for the second-season finale include virtual reality, happiness and Karl's wish for the British TV show "Jim'll Fix It."
Season 2, Episode 12
Topics include art; and suggested adaptations of literature and film featuring the Muppets.
Topics include the two sides of the brain and ESP; Karl's childhood encounter with a ghost named Mrs. Battersby; and an entry from Karl's diary about his mother's request to find a UFO magazine.
Season 2, Episode 10
Topics include Karl's opinion of a science report about blind mice that can see; his visit to a "professional leg rubber"; and his recollection of the time his father scored a huge quantity of a popular candy.
Topics include the value of discovering new species; Ricky's idea for a future car; Karl's speculation about alien involvement in the invention of the computer chip; and a documentary about a pregnant man.
Season 2, Episode 8
Topics include Karl's thoughts on academics' predictions for the future; and what the guys would do on the day the world ended.
Topics include Karl's ideal height; Stephen's evening at a club in London; and a poem from Karl's diary about his bout with kidney stones. Also: a "Monkey News" segment about a monkey on a toll bridge.
Season 2, Episode 6
Topics include Karl's bout with kidney stones; living things that resemble other things; Noah's Ark; romantic advice from Karl; and an entry from Karl's diary about a trip to the Cotswolds with his girlfriend.
Season 2, Episode 5
Topics include Karl's encounters with insects; optimal animal sizes; "Inside the Actors Studio"; and entries from Karl's diary about a new sea creature and a poem about moths.
Season 2, Episode 4
Topics include interesting facts about animals; the brain's role in everyday activities; and entries from Karl's diary about mimes, a Chinese man who can't be photographed and the wisdom of celebrating birthdays.
Season 2, Episode 3
Topics include animals and diseases; evolution; a domesticated housefly; and entries from Karl's diary about take-out food, human anatomy, twins, films with subtitles, bees and a former schoolmate who lives underground.
Topics include Karl's hypothetical doppelgänger; Ricky's logic riddle for Karl; Karl's comprehension of art; Karl's dislike for Ricky's cat; and Stephen's eventful trip to Rio de Janeiro for Carnival.
Topics for the second-season premiere include Karl's pitch to a movie studio for a Rebecca De Mornay thriller; and entries from Karl's diary about Australia, camping and visiting his girlfriend's parents.