How do butterflies fly? Why are butterflies called butterflies? How do airplanes fly? If gravity pulls everything down, how do planes and rockets get up in the air? Why do planes have engines and how do they make them? We're visiting ECHO, the Leahy Center for Lake Champlain and the Smithsonian National Air and Space Museum for answers.

Did you know pianos have strings and hammers? We're learning all about instruments and how they use strings to make noises.

Why are there so many plants? How are seeds made? How does germination work? How can plants grow so big if they start from such a small seed? Why are flowers different colors? Why are plants and trees green? Where does dirt come from? In this episode of But Why , we're talking about plants with garden consultant Charlie Nardozzi.

The discovery of seven new planets that could contain life has kids and adults pretty excited. We can't get to these planets yet but we do have tools to explore planets closer to home. In this episode, St. Michael's College astronomy professor John O'Meara answers how the Mars rover is driven from back here on earth?

Why are yawns contagious? Why do we hiccup? How do teeth get loose? Why do your ears hurt when you drive up over the mountains? Why do we get dizzy when we spin? Why do people slip? Why do people faint? Why do we have saliva and mucus? Why do people cry when they get hurt? How do voice boxes work? Why does your voice sound weird when it's recorded? Dr. Lori Racha has more answers to your body questions.

Why do your fingers and toes turn wrinkly in the tub? Why are people ticklish? How do you get freckles? Why do some people have birthmarks? How do our hands feel things? Are humans animals? Why don't humans have tails? Why do we need food and water to survive? Why do our nose and ears keep growing? How do bones connect together? We're talking about our weird and wonderful bodies with Dr. Lori Racha, a pediatrician at the University of Vermont.

Join experts Riley Woodford, a wildlife specialist from Alaska, Linda Holmes, an NPR pop culture journalist, and Brian Robinson from the world's largest zipper company for a lively discussion! Discover the fascinating science of how popcorn kernels pop and the role of moisture and heat. Learn about salmon's incredible journey home using their sense of smell and Earth’s magnetic field. Plus, unravel the mechanics of zippers, and explore how they're used even in NASA spacesuits—it's a fun blend of science, nature, and pop culture!

Why is all of the world split up into countries, states, cities and counties and more? Why can't we all just live as one big group? Which country has the least amount of people? We're talking about countries and borders with author Juan Enriquez. Also in this episode: why don't school buses have seatbelts?

How is chocolate made? Why can't we eat chocolate all the time? Why does chocolate melt? Why can't dogs eat chocolate? In this episode, we travel to Taza Chocolate in Somerville, Massachusetts to get some answers. Plus, we visit a coffee roaster in Maine to learn about this parent fuel that so many kids find gross!

We're getting answers to all of your weather questions! Where does snow come from? Why do clouds stay up in the sky? How hot is lightning? What are thunderstorms? How is wind made? Those questions and more are answered by meteorologist Mark Breen, author of The Kids' Book of Weather Forecasting.