Languages: English

The Big Question: “What would happen if someone cracked the Earth?”

Synopsis: Harrison gets permission from his school to build a very large volcano and with the help of a real-life volcanologist he creates a grand finale in the form of one of the largest mentos and cola eruptions ever concocted on television! Viewers learn what to do if the earth starts shaking.

My Great Challenge: Oozing lava must have swallowed up the challengers today. There is no great challenge in this episode.

In the Field: Roving reporter Sidney visits an exhibition on volcanoes and earthquakes, and gets to make her own mini-earthquake. She meets an adventurer who goes down inside active volcanoes and gets a live demonstration of how his flame-proof suit works when one of his friends sprays him with liquid fire!

The Big Question: “Why can’t we fly?”

Synopsis: With the aid of a wind-tunnel and a four-time national radio-controlled airplane champ, Harrison takes to the school yard to discover why some things fly better than others and viewers find out what it really takes to leave the ground.

My Great Challenge: Challengers take part in a paper airplane experiment to see who can make the best wing.

In the Field: Harrison goes out into the field with a bird trainer to get a close up look at two of the best flyers in the animal world – an owl and a falcon.

The Big Question: “How come weather changes?”

Synopsis: Harrison is visited by a real-life television weatherman who shows us how he predicts the weather. Viewers will learn how to gauge wind strength and direction from famous storm chaser George Kourounis as Harrison talks to him live from a location in America’s Tornado Alley.

My Great Challenge: Harrison and the weatherman create an in-studio challenge where kids try their hand at presenting a weather forecast in front of a green screen.

In the Field: Terrible storms must be in the area today…there is no In the Field segment in this episode.

The Big Question: “How does your nose get runny?”

Synopsis: Harrison is visited by a microbiologist who helps him take a close look at an invisible world and figure out how to stop viruses from hurting us. In the name of science, Harrison performs a top secret experiment at an elementary school to find out how quickly germs can spread. Viewers at home learn how to grow their own fungus.

My Great Challenge: Harrison tests school kids by seeing who among them can get their hands the cleanest.

In the Field: Roving reporter Sidney puts on a full containment suit and goes to a high-security lab where the most dangerous viruses in the world are studied. There, she discovers that not all germs are bad, and – surprise – we actually need some of them to survive!

The Big Question: “Do dinosaurs eat people?”

Synopsis: Harrison sets out to explore why it is that some animals evolve to be big, while others evolve to be small. He is visited by a miniature horse and its foal who help him find out why animals are bred to be different sizes. Viewers are encouraged to test their own ability to make themselves seem as big as possible!

My Great Challenge: Challengers take part in a competitive (and tasty!) experiment to find out whether it’s an advantage for a predator to eat big or small prey (or to be big or small prey).

In the Field: Harrison takes a trip to the aquarium to visit some of the biggest animals of all – whales!

The Big Question: “Why does my hair stick to my chair?”

Synopsis: A physicist visits Harrison to explain how electricity is generated, and teaches us how it can be conserved. Viewers can take part in a fun experiment to see electricity at work in their own bodies.

My Great Challenge: Kids race to complete a circuit! But before they can do anything they must find a way to transfer power over a short distance, from a battery to a light bulb, by determining what materials conduct electricity.

In the Field: Harrison goes to the Sea Aquarium to visit a marine expert and some willing aquatic life to explore why electric eels don’t electrocute themselves and how sharks can detect our presence because of electricity!

The Big Question: “Can a horse and a pig communicate?”

Synopsis: Harrison is visited by a very special guest – a parrot – and he tries to figure out if he can understand what it’s saying! Meanwhile, viewers get to test out their ability to communicate with dogs. Harrison also discovers why humans speak so many different languages.

My Great Challenge: Kids use their hands to pantomime ideas in an effort to communicate like our distant ancestors.

In the Field: Harrison sets off to the Sea Aquarium to see if dolphins can understand sign language.