Dear Dr. Universe: What are crystals? Who discovered them? -Kennedy, 9, Little Rock, AK
Dear Kennedy,
Maybe you’ve caught a snowflake on your tongue. Or sprinkled salt on your food. Perhaps you’ve imagined what it would be like to explore a big crystal cave. » More …
Dear Dr. Universe: What is slime? How can I make it? -Nina, 10, Richmond, VA
Dear 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. » More …
Dear Dr. Universe, Why are whales so large? -Hannah, Grand Island, NE
Dear Hannah,
Of all the whales that live in the sea, the largest are blue whales. In fact, blue whales are the biggest known animals to have ever lived on our planet. Yep—even bigger than dinosaurs. » More …
Why do cows burp methane? -Silas, 10, Seattle, WA
Dear Silas,
There are more than a billion cows on our planet and they all need to burp. Just like us, they burp to get rid of extra gas in their stomachs. » More …