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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 …

How are twins made?

Dear Dr. Universe: How are twins made?

Dr. Universe is a gray cat wearing her white lab coat, yellow pants, and red shirt in the forest when she runs into four nine-banded armadillos and starts thinking about what it would be like to have a twin. Her twin has blue glasses and a yellow shirt.

–Brody, 8, Kauai, Hawaii

Dear Brody,

By the time you finish reading this sentence, about twenty babies will have been born into our world. Sometimes they’re twins. » More …