Harrison investigates the stuff that holds us in: skin. With help from a special-effects make-up artist, he finds out the science behind scabs and bruises, and even learns how to make cool fish-monster scales. “How come humans don’t have scales?” Are parts of our skin more sensitive than others? Blindfolded challengers have to identify mystery objects rubbed against their foot, leg, and hands. Harrison goes to the beach with a skin scientist to test how sunscreen can protect UV-sensitive Frisbees from turning purple.

Harrison is on a quest to break a karate board with his bare hand, but first he’ll need some expert help – from a materials engineer and a karate master -- to understand the science behind why things break. Hiii-yaaa! “How can you break things with a karate chop?” Kids compete in an egg-drop challenge, to see what kind of padding materials can protect a raw egg when it’s dropped from a great height. Harrison has a dynamite time at a rock quarry when an expert helps him blow up rocks with real explosives!

Hold on to your nose! Harrison decides to do a show about, well, you know. He’s visited by a paleontologist who brings million-year-old fossils of dinosaur poop. “How do flowers poop?” Challengers have to pick apart fake animal poop to find bones, berries, and grass, and then guess whether the animal who made the poop was an herbivore, carnivore, or omnivore. Harrison and an animal biologist collect real animal poop in the woods, and then examine it in the lab. P-U!

Harrison finds out how a car works when a teenage race car driver brings her mini Formula 1 to Harrison’s house. “Is a Ferrari faster than a cheetah?” Challengers race remote-controlled cars along a track filled with obstacles to understand how road conditions can make driving hazardous. Harrison goes to a race track and gets to drive a real Ferrari! Then, with an expert driving instructor at the wheel, they burn rubber to see who’s faster – the Ferrari or a cheetah?

Harrison starts a pet-sitting service, but he’s soon overwhelmed by how much work it is -- especially when one of the pets turns out to be surprisingly wild. Fortunately, a zoo-owner friend helps him out. “Why don’t people have wild animals as pets?” Harrison’s studio is full of real animals – a bird, dog, hamster, and a cat. Challengers have to match various pet foods, toys, and other pet-care items to the correct pet before time’s up. Harrison visits a professional dog-trainer to get help with a particularly unruly puppy.

Someone took a bite out of Harrison’s cheese sandwich! Who was this nefarious nabber? To find out, Harrison brings in a detective and a forensics expert to collect fingerprints, DNA evidence, and other clues. “What clues do detectives need to figure out a crime?” How reliable is eyewitness testimony? To find out, challengers watch a video of a “crime,” and then Harrison and the detective quiz them about how much they remember. Harrison visits the world’s cutest crime fighters: police dogs! To test how they can sniff out a criminal, Harrison hides while the dogs follow their noses to find him.

Harrison wants to find out if he can really make gems from charcoal or gold from lead. A geologist guest shows him that other kinds of rocks are cool too, especially meteorites. Rocks rock! “When you squish a piece of coal, how does it turn into a diamond?” Challengers pan for gold in a stream, just like old-time miners. But watch out for fool’s gold! Harrison rappels down into a cave to see how stalactites and stalagmites are formed.

Harrison’s computer says that people do have tails. How is that possible?! To find out more about tails, Harrison invites animal experts who bring over a live kangaroo, skunk, marten, and snapping turtle. Turns out, different animals use their tails for different purposes. “Why don’t humans have tails?” Does a rabbit’s short tail make it harder to catch? To find out, challengers put on both long and short tails, and then have to run for their lives as “carnivores” try to catch them by the tail. Harrison visits a paleontologist at the natural history museum. By comparing vertebrate skeletons, Harrison discovers that tails – including our tailbones -- are evolutionary adaptations.

Harrison and a cheeky humanoid robot named Nao 1337 compete to see whether humans are better than robots. Along the way, Harrison discovers robots that’ll do everything from vacuum your room to play chess against grandmasters. “When will I have my own personal robot?” Kids from a champion robotics club strut their stuff as they compete to see who has the best robot. Harrison visits a tetraplegic who can do amazing things with her robotic arms.

Harrison’s water is shut off today because of a water main break, so he’s extra interested in how water is formed, and how we can conserve it. “Will water ever go extinct?” In some countries, kids have to carry water from a well instead of getting it from a sink. Our challengers compete to see how much of their daily water they can carry before time’s up. Harrison goes to fire-fighter training, where he puts out real fires with water.

To find out where dragon legends could have come from, Harrison goes on a quest to find the biggest, dragon-iest reptiles in the world. “Do dragons exist?” How can snakes move without legs? To find out, challengers squeeze into “snake suits,” then race to wriggle their way to the finish line. At a reptile zoo, Harrison handles real-life crocodiles and meets a cousin of the fearsome Komodo dragon.

Harrison wants to go to space, but first he’ll have to learn how to float in zero gravity, sleep “standing up,” and figure out how a rocket works. Fortunately, he knows some real astronauts who can help him out. “Can kids go into space?” Challengers in a “zero gravity” rig compete to see who can fix a broken satellite the fastest. At the Canadian Space Agency, Harrison samples astronaut food and learns how to “catch” a delivery of space groceries with the Canadarm2 robotic arm.

Harrison’s little sister decided to “improve” Harrison’s show by mixing up all the clips – and adding sparkly dancing unicorns. Now Harrison has to put his show clips back in order. As he goes through them, he notices that his sister picked clips that show how weird and surprising science is. Maybe she arranged them well after all (except for the sparkly unicorns, of course!).