Brewster, Maggie, and the twins wonder ‘Why do our heads hurt after we drink cold stuff too fast?’ They meet Thinky Brain. He explains that ice makes the mouth cold and when the brain tries to warm things up fast it gives you a headache feeling.
Helvetica notices that both the sun and moon are in the sky at the same time and she asks, ‘Why do we sometimes see the moon when the sun is out?’ The curious friends head into space where they meet Sonny Sun and Mr Moon who explain the reason to them.
Brandon shows Brewster and Maggie his composter. They wonder ‘Why do flies like to hang around stinky stuff?’ Inside the composter they meet Mortimer Fly and his mother Mummy Fly, who explain that stinky places are ideal areas to lay eggs.
Brewster, Maggie and Ginger Squirrel see the sunset on the beach. Ginger wonders, ‘Where does the sun go after dark?’ Brewster and Maggie would like to know too, so they ask Sunny Sun who explains that sometimes he goes to the other side of the world.