The Big Question: “Why when I build my castle tall, it always falls down?” Synopsis: Structures are things that we build, that make life easier, like a house or a bridge. Harrison finds out how animals have been building structures for millions of years, as well as the best way to build structures, to keep them strong and sturdy, and realizes that humans could learn a lot from beavers. My Great Challenge: Two teams of challengers build a bridge over dino-valley with marshmallows and pasta. Who will cross first, and who will be dino-dinner? In the Field: Harrison visits some really cool tree houses, and discovers that tension can be very relaxing.

The Big Question: “Why do we have to eat?” Synopsis: We have to eat, because our parents make us! But seriously, Harrison learns how good, healthy food helps us grow big and strong and smart, why foods taste different between boys and girls, and which junk foods disguise themselves to pretend that they’re healthy. My Great Challenge: How well do you know what’s in your food? Harrison surprises some challengers as they try to guess how much fat and sugar are in their favourite foods. In the Field: Yummy?? Bacon-flavoured popcorn is on the menu, washed down with onion soda. Harrison visits a company that makes flavours and creates some weird ones to share.

The Big Question: “Why can’t everything be solar powered?” Synopsis: Harrison takes a close look at the biggest star in our solar system – the sun, and learns that everything DOES run (at least indirectly) on solar power. Without the sun, we wouldn’t… we couldn’t, even be here! My Great Challenge: Before watches were invented, people used the sun as a clock. Harrison puts two challengers to the test to see if they can tell the time the ancient way. In the Field: Harrison takes a solar-powered boat cruise with its inventor.

The Big Question: “What would happen if you never cut your fingernails? Would they grow forever?” Synopsis: Every living creature that is born grows up. But HOW do they grow, and WHY do they stop growing? Harrison finds out if girls grow faster than boys and if you can make yourself grow taller. He also uncovers the real difference between humans and other creatures, and how scientists are working to make us more like salamanders. My Great Challenge: “Are you my Mommy?” Challengers race to match up photos of baby animals to their grown-up parents. In the Field: Harrison sees his future! The Vancouver Film School turns Harrison into an 80 year-old man!

The Big Question: “Do plants think?” Synopsis: Harrison discovers that plants are living things, and humans depend on them for survival not just for food and clothing, but also for the very air we breathe! Harrison investigates why flowers smell so nice and fruit tastes so good. My Great Challenge: Team Pine Tree and Team Maple race to see who sucks the most – water that is. In the Field: Harrison visits an organic farm to get the juice on grafting - naturally creating the strongest and best–tasting fruits and vegetables

The Big Question: “Why do some spiders have eight eyes?” Synopsis: How do we see? Why CAN’T we see some things? Why do cat’s eyes glow in the dark? Harrison sheds some light on one of our five most important senses: sight! He also learns that seeing more, doesn’t necessarily mean you can see well. My Great Challenge: Team Lion and Team Tiger search for camouflaged jelly beans. In the Field: Harrison visits 12-year old Tait in Calgary to learn how to have fun using your other senses, when you can’t see.

The Big Question: “Why are human teeth and animal teeth different?” Synopsis: Humans and animals have all different kinds of teeth because they eat all different kinds of things. Harrison finds out lots of new stuff about teeth, including why some are sharp and some are flat, why birds have beaks instead of teeth, and how overworked the poor Tooth Fairy is! My Great Challenge: Herbivore, carnivore or omnivore? Challengers guess if an animal is a meat eater, a plant eater or both based on their teeth. In the Field: Harrison visits his dentist, Dr. Cooperberg, to find out why taking care of his teeth is so important.

As Harrison prepares for his school science fair, he realizes that science is all around us. Highlights from this past season, including questions about the sun, plants, teeth and spiders, help prove his point.