Helvetica Frog is teaching Brewster and Maggie a new dance. She notices a rainbow and asks ‘why aren’t raindrops different colours?’ They meet Drippy who shows them that when the sun shines through the raindrops they make the rainbow colours.
Brewster, Maggie and Hamish are making onion soup and Hamish’s eyes water. He wonders ‘Why do onions make our eyes water?’ The friends meet Soup Dragon who explains the onion juice sprays into the air, wafts upwards and make our eyes water.
Brewster and Maggie help Hamish with his wagon. It is very hot and Hamish wonders ‘How does the sun make it warm?’ Up in space the three friends meet Sunny Sun who clarifies that sometimes he’s closer to the earth and that makes it hot.
Brewster, Maggie and the twins find a toy dinosaur. They wonder ‘Why don’t we see real dinosaurs?’ Brewster takes them to meet Dino-Biggles who describes how long ago the weather changed and the dinosaurs couldn’t survive in it, so became extinct.