Dear Carmen,

Right now, there’s a fly walking on the window in my office. I asked my friend Rich Zack how it does that. He’s an insect scientist at Washington State University.

It turns out my window isn’t as smooth as it looks. If we zoomed in on the glass, we’d see bumps and dips. It’s kind of like a rock face or a climbing wall.

“Surfaces look pretty smooth,” Zack said. “But if you get really, really close, you see there are all kinds of little indentations and crevasses. Even a pane of glass is not perfectly smooth. It’s got little nicks and … » More …

Dear Braelyn, 

Everyone feels grumpy sometimes—even a cheerful cat like me.  

Sometimes exhaustion makes us crabby. When we really need sleep, our brains struggle to do their jobs—like managing our emotions. Sometimes hunger makes us cranky. Our brains need a steady supply of sugar energy. When the available sugar drops too low, we feel terrible—or even hangry. Sometimes stress or problems like anxiety and depression make us grumpy. 

In all those scenarios, anger lets us know we need to change something. We need to sleep, eat or get some help with our problems.  

I asked my friend Anthony Lopez why we feel anger … » More …

Dear Haygarth,

I love glow-in-the-dark stickers. I leave them next to a sunny window for a little while. Then turn off the lights and watch them glow.

I asked my friend Hergen Eilers how those stickers work. He’s a physicist at Washington State University.

He told me that glow-in-the-dark things use a type of phosphorescence. That means they absorb energy—like light—and then glow. A material that can do that is called a phosphor.

Glowing in the dark works because of electrons.

Everything in the universe is made of atoms. That includes you, me, whatever you’re reading this note on—and glow-in-the-dark stickers.

All those … » More …

Dear Remmi,

Mars is about 140 million miles from our cozy planet. A human mission to that cold, rocky neighbor would mean being away from Earth for about 3 years. But the things those explorers would see and learn would be mind-blowing.

I asked my friend Katie Cooper about that. She’s a scientist at Washington State University. She studies how geology and physics work on Earth and other places in space.

She told me the weirdest thing on Mars is a ginormous volcano.

“Olympus Mons is the largest volcano in the solar system,” Cooper said. “It dwarfs Earth’s volcanoes! Its massive size helps … » More …

Dear Dean,

There’s a pencil lying on my desk right now. It’s not much to look at, but what if I could zoom way in and see the protons and other itty-bitty stuff inside it?

My friend Ryan Corbin told me it would be like looking at a bubbling soup of fundamental particles. He’s a quantum physicist at Washington State University.

He told me that protons—along with neutrons—form the nucleus in the middle of an atom.

“Atoms make up all the stuff that we see,” Corbin said. “An atom has neutrons and protons in its nucleus. Protons have a positive electric charge. Neutrons … » More …

Dear Zara,

I love visiting the vet. But, like many cats, sometimes I need medicine to keep me calm.

I talked about that with my friend Lais Malavasi. She’s a veterinarian at Washington State University.

She told me about two kinds of calming medicine. Vets and human doctors use them to reduce pain and fear.

Sedatives make patients feel relaxed and sleepy. But they’re mostly aware of what’s going on. When the medicine wears off, they’ll probably have fuzzy memories.

Anesthesia makes patients unconscious. They can’t feel pain or move. They aren’t aware of what’s going on. When they wake up, they won’t … » More …

Dear Dru,

When it comes to intestines, it sure seems like two are better than one.

I asked my friend Franck Carbonero why that is. He’s a microbiologist at Washington State University. He studies the bacteria that live inside the human gut.

He told me that the small intestine and the large intestine do different jobs.

Let’s say you sink your teeth into some pizza. You chew it up and swallow it. All those chewed up bits land in your stomach. They mix with digestive juices and start to break down. The broken-down food and digestive juices together are called chyme. After … » More …

Dear Lucy, 

Cats like me don’t have wisdom teeth. So, imagine my surprise to learn some of my human buddies get extra chompers. 

I asked my friend David Carsten about it. He studied biochemistry at Washington State University. Now he’s a dentist who teaches about dental sedation and anesthesia at Oregon Health & Science University. 

Dr. Carsten told me that humans can get three sets of permanent molars. Molars are the big grinding teeth in the back of your mouth. The third set—also called wisdom teeth—usually come in when you’re between 17 and 21 years old. If you get them at all. 

Wisdom … » More …

Dear Devyn,

I love insects, but—between you and me—I’m a little scared of spiders. I’ve been nervous around them ever since I was a kitten.

I talked about our fears with my friend Paul Strand. He’s a psychologist at Washington State University.

He told me that anxiety about insects or spiders is common. Some people even have phobias of them. That’s an intense fear that causes distress.

Many common fears involve things that were probably dangerous to our ancestors—like snakes, the dark, heights and social rejection.

Strand told me that being afraid of insects is similar.

“It’s almost like a double whammy,” he said. … » More …

Dear Hailey,

Under my lab coat, I have a splendid fur coat. That can be a problem when I work with someone who’s allergic to cats.

I asked my friend Ed Johnson about it. He teaches classes about the human body at Washington State University.

He told me that allergies happen when your immune system overreacts to a normal thing it perceives as a threat to your body. That thing can be pollen, dust, food, medicine, insect venom or something else. It can be bits of fur and shed skin called cat dander.

“The immune system evolved to protect the body,” Johnson said. … » More …