How is chocolate made? -Lydia, 6, Bedfordshire, England
rcwebberDear Lydia,
A few thousand years ago, humans discovered that beans inside the bright green pods of cacao trees could be made into a real treat.
Read More ...Dear Dr. Universe: What is slime? How can I make it? -Nina, 10, Richmond, VA
rcwebberDear Nina,
Our world is full of slime makers. Slugs and snails leave behind gooey trails. Bacteria can create layers of slippery slime in water pipes. Even your body makes its own kind of slime. In our joints, we have slime that helps protect our bones.
Read More ...Dear Dr. Universe: Why do leaves change colors? -Lucy, 5, Seattle, WA
rcwebber
Dear Lucy,
Ever since I was a kitten, I’ve loved picking up big maple leaves in the fall. I’d take them home, put them under a piece of paper, and rub the side of a crayon over the top. It makes a great print of the leaf.
Read More ...Why do onions make us cry? -Kera, 5, Lawrenceville, GA
rcwebberDear Kera,
Try as we might, it can be hard to hold back tears while chopping up onions.
Read More ...Why don't plants get sunburns? -Elijah, 5, Seattle, Wash.
rcwebber
https://www.youtube.com/watch?time_continue=2&v=_34991Wdq4s
Dear Elijah,
That’s a great observation. For as much time as plants spend outside in the sun, we really don’t see too many with a sunburn.
Read More ...What is fire? -Anish P., 10, Nepal
rcwebberDear Anish,
There’s nothing like taking a little catnap by the fireplace, feeling the heat, watching the flames, and listening to crackling sounds. But until you asked, I wasn’t entirely sure what this mesmerizing thing was or how it works.
Read More ...Dear Dr. Universe: I want to know how my family car works. How does the gas reach the engine and go? How does the steering wheel make the car turn and how do the brakes help us to stop? -Jordan, 6, Queens, New York
rcwebberDear Jordan,
As a cat, car rides can sometimes make me feisty. But as a scientist, it’s fascinating to learn about the mechanics, engineering, and chemistry fueling the cars humans drive every day.
Read More ...How do I make a diary? -Nimra, Kitchener, Ontario
rcwebberDear Diary,
Oh, I mean...Dear Nimra,
Making a diary is like creating your own top-secret book. So, I headed straight for a Washington State University library where there are more than a million books.
My friend Linnea Nelson was working with some of the books from the special collections when I went to visit her in the lab. She is a conservator, so part of her job is to repair and re-build old books. It preserves their history.
Some of the books had an old smell that wafted up into my little nose. The smell comes from different chemical compounds that escape into the air, including one similar to vanilla. The compounds are in the ink, paper, and other materials used to keep the pages together. And one way to keep the pages together is to bind them with thread.
Read More ...