An animated series about the life and adventures of two funny, abstract characters, Op and Bob. In each episode, they encounter a new concept and learn about the world around them. E42: Liquid Thick Op & Bob bake a cake and learn about the different consistencies of cake mix. E43: Solid Liquid Op & Bob see an ice sculpture and learn that when ice melts it turns from solid to liquid. E44: Bad Guy Op & Bob run into a robber and learn to be on the lookout for bad guys. E45: Crosswalk Op & Bob are running late but learn that no matter what, you must always use the crosswalk. E46: Viruses Op & Bob go to the doctor’s office and learn about the different viruses that can make you sick. E47: Elevator Op & Bob visit a very tall building and learn about taking the elevator.