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On Thursday, February 18th, a robot called a rover is expected to land on the surface of Mars, and begin collecting information scientists hope will help�

What makes a cactus a cactus? And what are you supposed to call a group of these plants--cacti, cactuses, or cactus?! We'll find out in today's episode,�

How do whales spray water? Why are humpback whales so fat and blue whales so long, and why are blue whales blue? Do whales have belly buttons? How do you�

Why do forest fires happen? What happens to the forest after a fire? Sometimes you send us questions about things you've heard about, and sometimes you�

On Friday, June 12th we answered your question about trees and tree communication with scientists Alexia Constantinou and Katie McMahen of the Simard Lab�

What is slime and how do you make it? What makes glue sticky? Why does mixing diet coke and Mentos make an explosion? How does glow in the dark stuff glow�

But Why answered your questions live on-air on Friday, May 22!We talked about space exploration with Jim Green, chief scientist at NASA. We also learned�

Where is the border between sky and space? That's what 5-year-old Matthias of Durham, New Hampshire wants to know. Alesandra, 3 of Bella Vista, Arkansas�

How does water turn into ice? Why is ice sometimes slippery and other times sticky? Why is it so cold? Why does it float? How are icicles made? Why are�

How do weather people predict the weather and know what's going to happen tomorrow? Why is a meteorologist called a meteorologist? We learn about weather�