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Why do we have bones? How do they grow–and how do they know when to stop growing? How many do we have in our bodies? And when we break our bones, how do they heal? What do casts do? And how do you know if you’ve broken a bone? Broken bones are a common occurrence in kids. Up to 40% of girls and up to 50% of boys will break a bone in their lifetime. In this episode, we learn about the role of bones in our body and how to deal with a fractured bone with Melissa Raddatz, a family nurse practitioner at Duke Health System in North Carolina. The first part of this episode is all about bones in general, and we shift to broken bones for the second half.

How do wind turbines work? How are wind turbines made? What will our energy picture look like in the future? We’re taking a deep dive into wind power, and trying to make the technology understandable, with Josh Castonguay of Vermont utility Green Mountain Power.

Come along to learn all about the wriggling worms that live in the dirt beneath your feet. Earthworms are everywhere, and there are many species of worms yet to be discovered. How do worms communicate? Why do worms have slime? Why do worms come out when it rains? Answers to all of your worm questions with earthworm detective Sam James. Plus, we learn about worm composting with a kid who’s in charge of her family’s food scraps!

At the peak of the summer heat, it’s nice to cool off with a quick dip in a pool or lake. But it’s important to know how to swim if you’re going to be around water! So, for this episode, we took a field trip to a local pool. Upper Valley Aquatic Center Swim School Director Kana Wyman gives us some tips on how to get comfortable putting our heads in the water, learning to float and more.

We’re celebrating the Olympics and Olympic athletes with an episode chock full of the interviews we’ve done with Olympians. Plus we answer some of the Olympic-themed questions you’ve sent us, starting with: what’s all the hype about winning a big piece of metal? And are those medals really made out of gold, silver and bronze? And we speak with Paralympian Emelia Perry, who’s competing in the paratriathlon in Paris! (Other athletes we hear from: skier Andrew Weibrecht, bobsledder Elana Meyers Taylor, and mountain biker Lea Davison.)