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Ask Dr. Universe Archives

How do plants hold dirt? -Gordon, Pullman, WA

Dear Gordon,

The other day, I wandered into a Washington State University greenhouse and ran into my friend Mechthild Tegeder, a professor and expert on plants.

She gently dug a small plant out of a pot so we could take a closer look. When she lifted it up, I pawed at the clumpy soil hanging from the bottom to reveal some stringy roots.

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What is the Kuiper Belt? -Zaara A., 7, Deep Bay, Australia 

Dear Zaara,

You might say the Kuiper Belt is the frozen frontier of our solar system. Out beyond Neptune’s chilly orbit, this saucer-shaped region is home to Pluto, billions of comets, and other icy worlds.

“The Kuiper Belt is really the edge of knowledge,” said my friend and astronomy professor Guy Worthey when we met up in the Washington State University planetarium.

“Out there it’s a little dim,” Worthey said. “We are pretty far from the Sun.”

In fact, it’s about 3 billion miles away. Even at the speed of a jet airplane, it would take more than 680 years to travel from Earth … » More …

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What is Dr. Universe's favorite experiment? -Garrett, 8th grade, Eastern Washington

Dear Garrett,

You know, your question reminds me of a couple other science questions from curious readers. Evangeline, age 7, wants to know why her hair is black. Sureya, age 8, wants to know why some people have curly hair.

It just so happens that one of my favorite science projects explores our questions about what makes us unique. It has to do with our DNA, or the blueprint for life.

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Why is Pi 3.1415...? What if it was just 3? -anonymous

Dear Curious Readers,

It’s almost March 14. You know what that means: Pi Day, as in 3/14, or 3.14159265359 and so on.

I met up with my friend Nathan Hamlin, a mathematician and instructor here at Washington State University, to explore your question about this never-ending number.

We calculated Pi with some of my favorite items: yarn and a tuna can. You can try it at home, too.

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Are we getting lazier? -Aaryan, 9, Timber Ridge

Dear Aaryan,

We cats have a reputation for being lazy. We sleep a lot. But the truth is when I got your question, I didn’t know much about laziness. So, I decided to talk about it with a couple of psychologists here at Washington State University.

My first stop was the Psychology of Physical Activity Lab. That’s where I met up with my friend, Professor Anne E. Cox.

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Why is yawning contagious? -Grant, 10, Pullman, WA

Dear Grant,

When I got your question, I met up with my friend Hans Van Dongen, a scientist at Washington State University in Spokane. He works in a research lab where they study sleep. As a cat who appreciates naps, it’s one of my favorite places to visit.

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Dear Dr. Universe, Please answer this question: Do animals dream? What dreams do they get? I humbly request you to answer these questions. BYE! Or should I say MEOWY! -Prahlad R.

Dear Prahlad,

After a quick catnap and a stretch, I went to visit my friend Marcos Frank, a scientist at Washington State University who studies animal sleep.

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Dr. Universe: Are aliens real? -Lily, 10, New York City, NY Is there life on other planets? -Heidi, Cincinnati, OH 

Dear Lily and Heidi,

Well, we don’t know for certain. Looking up to the stars at night, I’ve often wondered if alien cats are out chasing alien mice or taking naps on other planets.

My imagination aside, your questions are like those scientists are asking, too. And it’s no wonder we are so curious.

With billions of planets in our galaxy, including small Earth-like worlds, the possibility of life out there is an exciting thought to many people. So, humans have set out to look for planets that might support life.

In fact, this month scientists announced the Kepler spacecraft’s discovery of … » More …

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Why do scientists use Latin when they name organisms? – Arielle, New York

Dear Arielle,

Language changes all the time. Words get new meanings. New words get made up.

I talked about it with my friend Rich Zack. He’s an insect scientist at Washington State University. He does taxonomy. That’s the science of naming and classifying living things.

The way language changes is amazing—and skibidi. It’s neat that language morphs as we use it. But that can limit how well we understand each other. Some readers might see “skibidi” and think I passed out and hit random keys.

That’s the main reason scientists use Latin or ancient Greek to name things. They’re dead languages. Nobody uses … » More …

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I hate sleeping. Do I really need to sleep? - Diedrich 

Dear Diedrich,

Like most cats, I enjoy curling up for a quick snooze by my sunny office window. But I know that some people don’t love sleeping. They want to go go go without a break.

I talked about that with my friend Greg Belenky. He runs the Sleep and Performance Research Center at Washington State University’s Spokane campus.

He told me that we need to sleep. Without it, we can’t do basic or complex things.

“All you have to do is look at behavior,” he said. “Somebody who’s sleep deprived for 84 hours can hardly do anything. They’re docile and easily led. They … » More …

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Will I ever like Brussels sprouts? - Susan 

Dear Susan,

Cats aren’t usually big veggie-eaters. But working with humans means that I get to taste all kinds of new delicacies—like Brussels sprouts.

I talked about food preferences with my friend Carolyn Ross. She’s a chemist and food scientist at Washington State University.

She told me that some people are extra sensitive to how foods taste. They’re called supertasters.

“Supertasters actually have more taste buds,” Ross said. “We’ve found that people who are supertasters are particularly sensitive to bitterness.”

Bitterness really strikes at a supertaster’s fungiform papillae. Those are the mushroom-shaped lumps on your tongue that house your taste buds. Because of … » More …

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