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What can you tell me about Mars?

Dear Dr. Universe: What can you tell me about Mars? Is there life there? – Coleman, 10, Spokane, Wash.

Dear Coleman,

People have wondered if Mars has life for a long time. About a hundred years ago, an astronomer named Percival Lowell looked through a telescope and thought he saw canals—a possible sign of water and life as we know it—on Mars. » More …

Why do dogs and cats fight?

Dear Dr. Universe: Why do dogs and cats fight? – Karri, 10, Essex

Dear Karri,

Because cats and dogs are different species, they aren’t usually friends in nature. Dogs in the wild see cats as prey, and cats see dogs as a threat. » More …

How do snakes slither?

Dear Dr. Universe: How do snakes slither? –Brayton, 10, Hawaii

Dear Brayton,

Snakes slither to move around because they have no legs. They rely on their muscles and scales.

The scales on a snake are made from a material called keratin. That’s the same material that makes up human fingernails. They help the snake move on different surfaces. » More …

Where do butterflies go when it rains?

Dear Dr. Universe: Where do butterflies go when it rains? –Charleigh, 8, Minor Hill, Tenn.

Dear Charleigh,

Whenever there’s heavy rains or winds, butterflies seem to disappear. This is because butterflies hide when it rains. That’s what I found out from my friend David G. James who is an associate professor at Washington State University. He studies insects, including butterflies, in the Pacific Northwest. » More …

What can you tell me about parasites?

Dear Dr. Universe: What can you tell me about parasites? -Brianna, 12, Eastern Wash.

Dear Brianna,

A parasite is an organism that steals resources from another organism in order to survive. Our planet is home to all kinds of parasites and organisms that host them. » More …

How does our refrigerator work?

Dear Dr. Universe: How does our refrigerator work? -Brody, 12

Dear Brody and Friends:

While a stove or oven produces heat, a fridge can’t actually produce something called “cold.” So, how does a refrigerator manage to keep all your food cool? » More …

Is there such thing as cold?

Hi Dr. Wendy Sue: Me and my brother had a little bit of an argument about the point that there is no such thing as cold. He said liquid nitrogen produces cold, which I think is absurd, but lack the knowledge to explain it. Can you please explain to us why there is no cold?

– Brody, 12

Dear Brody,

It’s a snowy morning and the thermometer reads 20 degrees Fahrenheit. You grab a jacket and a pair of mittens for your paws. It’s going to be a cold day. » More …

Who came up with the word “science”?

Dear Dr. Universe: I was wondering, how did science get its name? Who thought of it? Does it mean something special? -Jada, 10

Dear Jada,

If you were to travel around the world, the word “science” might look or sound very different. In Spanish, it’s ciencia. In Japanese, 理科. In German, wissenschaft! And in French…well, it’s also science. But with an accent.  » More …