Dear Malcolm,

I was surprised the first time I saw a human transform into a tickle monster. They curled up their fingers and rhythmically poked someone else’s armpits. That is something a cat would never do.

I asked my friend John Wright about it. He’s a retired psychology professor at Washington State University.

I learned that there are two kinds of tickling.

The first is the light tickle you feel when someone gently brushes your skin. Like when someone uses a feather to barely touch the inside of your arm. Scientists call that knismesis.

It turns out you can totally tickle yourself that … » More …

Dear Jeff,

The worst thing about being an anthropomorphic cat is that I have to scoop my own litter box. It’s a real drag.

I asked my friend Henry Mroch why we need to pee in the first place. He’s a doctor at Washington State University. He teaches medical students about the organs that make urine—called kidneys.

He told me that most people have two kidneys. Each one is about the size of your fist. They sit near your back, right under your ribcage.

Each kidney attaches to a tube called a ureter. Those tubes take urine to a storage pouch—called the … » More …

Dear Grant, William and Kate,

When I was a kitten, I liked to scratch tree trunks. I loved sinking my claws into their bark. Now I mostly hug trees—but I still love the way bark feels under my paws.

I asked my friend Henry Adams why trees have that tough outer layer. He’s a tree scientist at Washington State University.

He told me that bark protects trees.

“Bark is like our skin,” Adams said. “It protects trees from all kinds of attackers that might want to get in—like viruses, bacteria, fungi, insects or even non-living things like fire.”

Dear Kingston,

When we think about orbits, we usually picture the Earth zooming around the sun. But does the sun just sit there? Or is it on its own journey?

I asked my friend Guy Worthey. He’s a space scientist at Washington State University.

He told me that an orbit happens because the gravity from something big pulls on a moving object. The sun has lots of gravity because it’s ginormous compared to Earth. So, that gravity pulls on the Earth and holds us in orbit.

But our sun isn’t the only star. It’s one of many, many stars in the Milky … » More …

Dear Jalane,

I’ve always been a bookish cat. I spend most of my time in the lab rather than running, prowling and pouncing like most felines.

But I still have super strong muscles. They’re way bigger than when I was a kitten.

I asked my friend Edward Johnson how I got so buff. He teaches classes about the human body in the School of Biological Sciences at Washington State University.

He told me that muscles are made of muscle cells. They’re also called muscle fibers or myocytes.

We usually think cells are way too small to see with our eyes. But … » More …

Dear Seth,

Since I’m a fluffy cat, my fur protects me from the sun. But my hairless cat and human friends use sunscreen when they go outside.

I asked my friend Michael Smerdon how it works. He’s a biochemist at Washington State University.

He told me that the sun puts out different kinds of light. Some light is visible to humans. Some is invisible—like UV light.

Dear Fiona,

When I was a kitten, I loved chasing butterflies. It’s fun to run after them as they flit and flutter.

But I didn’t eat them.

I asked my friend Rich Zack if that was an oversight. He’s an insect scientist at Washington State University.

He told me that insects are animals with muscles just like other animals that people eat—like cows and chickens.

“Insect muscle tissue is almost exactly the same as mammalian muscle tissue,” Zack said. “So, if there were a way to get that muscle tissue and process it, you could eat an insect steak or an insect hamburger.”

Dear Lebron,

One of my favorite sights is when geese fly south in a “V” formation. As a cat, I’m pretty independent. So, I think it’s amazing to see birds fly together like that.

I talked about why birds migrate with my friend Heather Watts. She’s a biologist at Washington State University. She studies important animal behaviors like migration.

She told me that migration is a movement animals make that’s outside their normal day-to-day pattern. It’s usually a temporary movement. They leave for a little while and then come back.

Lots of animals migrate, but we usually think of birds doing it. The … » More …

Dear Ziyonna,

What happens if you do a big jump? Your body goes up into the air. But then it comes back down again. The reason you don’t just keep going up, up, up is because the force of gravity pushes your body and the Earth together.

It turns out gravity is a big reason the sun is so hot. That’s what my friend Michael Allen told me. He’s an astronomer at Washington State University.

He said that, at first, the universe was like a thick soup of gas and dust. Then, gravity pushed some of the gas and dust together. That’s how stars … » More …

Dear Trevor,

Everything we do and think is thanks to the 3-pound organ tucked into our skulls. But what is it made of?

I asked my friend Samantha Gizerian. She’s a brain scientist at Washington State University.

She told me the brain is surprisingly soft and mushy.

“We think about our other organs and tissues, and they’re squishy in a very solid way,” Gizerian said. “Like when you go to the grocery store and get a carton of meat. You can squish on the steak, right? Our other organs are mostly like that as well. But the brain is very, very delicate.”

She told … » More …