Soft bodied invertebrates have no bones or major hard parts, which gives them some big advantages.
Many of the earth's scariest creatures are actually just trying to survive.
Extreme cold can be dangerous, but some animals and plants can adapt to it. Throughout human history, our species has used ingenuity to adapt too.
Many animals and plants have poison or venom for survival. We humans have found ways to protect ourselves, but we still need to be careful.
By getting to know our food, how it's made and where it comes from, we can make choices that can help the environment and even change the world.
From lightning to lightning bugs, nature and the cosmos create it own light in a spectacular variety of ways.
Humans have been discovering and inventing things since the dawn of our species, but there's still lots more to discover and invent.
Pain is unpleasant, but it's our body's way of telling us when we are hurt, sick or in danger.
Our brain can play tricks on us, and there's a lot of cool science in what fools our senses.
Forests are important to humans, animals, and the entire ecosystem: a home for many creatures, a source of oxygen to breathe, as well as many products like wood and paper, and even medicines.
We often think that sticky is icky, but nature uses stickiness in many ways.
Darkness is a state that means there is low level light or absence of light, and it influences all life forms on Earth.
Harrison's little sister decided to improve Harrison's show by mixing up all the clips and adding sparkly dancing unicorns.
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.
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.
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.
Harrison and a cheeky humanoid robot named Nao 1337 compete to see whether humans are better than robots.
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