chest light up when he beeps, and Tim usually translates what he's saying. Moby is Tim's friend but loves to drive him crazy. Moby helps out by fetching things for Tim and asking questions about the topic they are discussing. As a robot, he can do things that people are unable to do, such as changing his hand into a freeze-ray, sending himself back in time, removing his head, and using lasers. Some of the movies, such as the Earth, Radar and Milky Way videos, imply that Moby is of an extraterrestrial origin. However, the Leonardo da Vinci movie implies that he was invented by Leonardo. Other characters Cassie and Rita are two teenage girls who are mainly featured in comics that accompany many of the movies in the "FYI" section. They also occasionally appear in the main movies and even narrate a few of them. Like Moby, Cassie enjoys annoying Tim, while some of the movies imply that Rita has a romantic interest in Tim and that he returns her feelings. Bob is a rat with a broken tail and a patched chest. He is featured in, and often conducts, experiments called "Experiments with Bob the Ex-Lab Rat", which relate to mostly science movies. Gary and gary are a father and son featured in comics called "How To With Gary and gary", which show how to do something safely. The capitalized "Gary" is the father, and the lowercase "gary" is the son. BrainPop Jr. BrainPop Jr. was launched in 2006. It is similar to BrainPop in subject areas, but the movies are geared towards grades K-3 (age 5–8). The hosts are Moby and a little girl named Annie. Like the regular BrainPop, the site offers a free "Movie of the Week", as well as several free movies in the different curricular areas. Common Sense Media called "BrainPop Jr. "a high-quality educational site that kids can navigate easily on their own. This interactive site includes videos, audio prompts, and graphics familiar to kids in an ideal format for young learners. Kids can take their enjoyment of videos to the next, more effective, level and do something with what they've just watched online … [and explore] sub-categories, like the science and math sections. If your K-3 child likes to learn things online, this site is worth the subscription fee." Common Sense Media also praised the free movies' video quality and topic