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We鈥檙e bringing back an episode from the archives, all about the moon: Why does the moon change shape? How much does it weigh? What color is it? Why does the Earth only have one moon? Why does it have holes? Where does it go when we can't see it? Why do we sometimes see it in the daytime? And why does the moon look like it's following you when you're in the car? Answers to your moon questions with John O'Meara, chief scientist at the W.M. Keck Observatory.

What causes wind? How is wind created? Why does the wind blow in different ways? How does the wind start blowing and what makes it stop? Why is it windy by the ocean? Why does it get windy when the weather is changing? How is it you can you feel and hear the wind but not see it? Why is the wind sometimes strong and sometimes cold? Answers to all of your wind questions with National Weather Service Meteorologist Rebecca Duell.

We asked our listeners: if you could invent anything what would it be? And we got so many fantastic ideas from kids all over the world: a solar cooler, a chimney that changes carbon dioxide to oxygen, a slide that gives you an ice cream cone at the bottom, and more. Some kids would like to invent robots that do their chores, flying cars, teleporting devices to take them back in time, and even a bully behavior zapper.This episode is all about creativity! But how do you take a great idea and turn it into reality? We鈥檒l get advice from teenage brothers Ayaan and Mika鈥檌l Naqvi, who invented, patented and now sell Ornament Anchor after Ayaan came up with the idea in fourth grade.

Why do seasons change? Why does it get darker earlier in the winter and why is there more daylight in the summer? Why are some seasons warm and some are cold and icy? Why do some places not have seasonal changes at all? We鈥檙e learning about solstices, equinoxes and seasons in this episode of But Why. Our guide is John O鈥橫eara, Chief Scientist at Hawaii鈥檚 Keck Observatory. And kids around the world tell us what they like best about their favorite season.

Why is the Burj Khalifa so tall? That鈥檚 what 5-year-old Simon wants to know. The Burj Khalifa is the tallest building in the world and it鈥檚 located in Dubai. 6-year-old Isabel, who lives in Dubai, visited the tower and gives us the bird鈥檚 eye view in this episode! Plus, Janny G茅d茅on, architecture educator and founder of ArchForKids answers lots more questions about tall buildings: How are tall buildings built? How do they stay up? Why are so many buildings squares or rectangles? How do they make buildings that are taller than cranes?

How are fireworks made? What are fireworks made of? How do they set off? Why are fireworks bright? Why are they loud? And why do we celebrate with fireworks on the fourth of July? We learn about pyrotechnics with Dr. John Steinberg, a physician and licensed fireworks professional. And we鈥檒l hear from David Chavez, an explosives expert at Los Alamos National Laboratory about how changes to the materials used in fireworks can make them better for the environment and unleash new, more vibrant colors in the night sky.

Are seeds alive? What are they made of? Here in Vermont it's planting time, and we've been getting a lot of questions about seeds from kids around the鈥�

How are rocks made? Why are some rocks hard and others soft? How do rocks shine? How are geodes and crystals made? Why do some rocks have gems in them?鈥�

In the ice age, megafauna roamed North America: mammoths, saber-toothed cats, even giant land sloths! What happened to them? In this episode we answer鈥�

In 2019, we answered a question about the Great Pacific Garbage Patch, a huge mass of plastic and other trash swirling around in the Pacific Ocean. Mary鈥�