Languages: English

The Big Question: “Why don’t people have wild animals as pets?”

Synopsis: 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.

My Great Challenge: 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.

In the Field: Harrison visits a professional dog-trainer to get help with a particularly unruly puppy.

The Big Question: “What clues do detectives need to figure out a crime?”

Synopsis: 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.

My Great Challenge: 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.

In the Field: 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.

The Big Question: “When you squish a piece of coal, how does it turn into a diamond?”

Synopsis: 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!

My Great Challenge: Challengers pan for gold in a stream, just like old-time miners. But watch out for fool’s gold!

In the Field: Harrison rappels down into a cave to see how stalactites and stalagmites are formed.

The Big Question: “Why don’t humans have tails?”

Synopsis: 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.

My Great Challenge: 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.

In the Field: Harrison visits a paleontologist at the natural history museum. By comparing vertebrate skeletons, Harrison discovers that tails – including our tailbones – are evolutionary adaptations.

The Big Question: “When will I have my own personal robot?”

Synopsis: 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.

My Great Challenge: Kids from a champion robotics club strut their stuff as they compete to see who has the best robot.

In the Field: Harrison visits a tetraplegic who can do amazing things with her robotic arms.

The Big Question: “Will water ever go extinct?”

Synopsis: 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.

My Great Challenge: 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.

In the Field: Harrison goes to fire-fighter training, where he puts out real fires with water.

The Big Question: “Do dragons exist?”

Synopsis: 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.

My Great Challenge: How can snakes move without legs? To find out, challengers squeeze into “snake suits,” then race to wriggle their way to the finish line.

In the Field: At a reptile zoo, Harrison handles real-life crocodiles and meets a cousin of the fearsome Komodo dragon.

The Big Question: “Can kids go into space?”

Synopsis: 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.

My Great Challenge: Challengers in a “zero gravity” rig compete to see who can fix a broken satellite the fastest.

In the Field: At the Canadian Space Agency, Harrison samples astronaut food and learns how to “catch” a delivery of space groceries with the Canadarm2 robotic arm.

Synopsis: 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!).