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Ask Dr. Universe Chemistry
University Communications Network > Ask Dr. Universe > Academic Subjects > Chemistry

Why does milk cure the spicy feeling in your mouth after you eat something spicy but water doesn't? – Eloise, 10, Minnesota

Dear Eloise,

My work as a science cat has introduced me to human foods—like chips and salsa. I love the spicy taste of salsa, but I always keep a saucer of milk handy.

I talked about why milk calms the spicy feeling with my friend Emily Cukier. She’s a chemistry librarian at Washington State University.

She told me that the spicy feeling comes from something called capsaicin. The amount of capsaicin in a pepper determines how hot it is.

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Dr. Universe: How do people stain glass to make it all the colors it can be? - Emily, 10, Edmonds, WA

Dear Emily, Ever since humans discovered they could use sand to make glass, they’ve been experimenting with it. They even learned how to control the colors. My friend Dustin Regul is a stained glass artist and painter who teaches fine arts at Washington State University. He told me more about where glass gets its color. “It’s actually metals that help change the color of the glass,” he said. Read More ...

Dr. Universe: Why does soap get bubbly? Samuel, 9, East Peoria, IL

When you wash your hands with soap and water, a few different things happen to make bubbles. Just like you, water and soap are made up of parts called molecules. Water molecules really like to stick together. If you’ve ever jumped in a puddle or a pool, you may have even observed how water splashes in the shape of little drops. As water sticks together, it likes to form spheres. Read More ...