Warning! This episode is all about the fascinating and gross world of doo doo.

This episode brings you a slew of dog and cat mystery sounds to puzzle over.

In this episode, we ask: Why do some foods taste better to adults than kids?

We have some questions about sleep: It’s ok to stay up late, right? Is it possible to control your dreams? Do all animals sleep? Why do we need to sleep anyway?

The questions asked and answered in this episode include: What is harmony exactly? What does it take to be a great rapper? How does sound travel?

We’ll explore the water cycle from rain to your drain.

The questions we have about numbers are uncountable.

After a caterpillar goes into its chrysalis, you would expect a beautiful butterfly to emerge. But when this parasitoid attacks, the results are very different.

Gravity is a very familiar force to us here on Earth.

Monarch butterflies are unique — they’re the only butterfly to travel thousands of miles when the seasons change.

This question has been a mystery for millennia. Turns out there’s a name for the phenomenon: photic sneeze reflex.

In this episode, we learn about how jellyfish sting and how they eat. Plus: stro-bi-la-tion (how jellyfish grow up).

The biggest volcano in our solar system is not on Earth — and its footprint is as big as the entire state of Arizona.

Almost everybody is ticklish, but what’s happening to us is a bit of a mystery.

Find out how these amazing sea creatures use three colors, two layers of skin and papillae to make them the ultimate shapeshifters.

Kids love trees. How do we know? They send us a LOT of questions about our bark-wrapped friends.

We talk to Dr. Alan Stern, the leader of NASA’s mission to Pluto – New Horizons.

We’ll find out how they’re built, where they’re found in nature, and what they may look like in the future.

There’s all sorts of weather happening right now around the world.

In this very important debate, producers Marc Sanchez and Sanden Totten try to get the bottom of our feline friends’ mysterious behavior.