Ever wondered why some spices burn your throat while others tickle your nose? Or why some of us live for spicy foods while others sweat at the mere thought of a habanero? How do pickles stay crunchy if they’re sitting in brine for weeks on end? And why do we have such different food preferences from our friends? We’re answering your food questions with chef and author Kenji López-Alt, author of the kids book Every Night is Pizza Night and co-host of The Recipe.

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It’s summer and that means slathering yourself with sunblock before you’re allowed to go run around outside. Not everyone loves that ritual: sunscreen can be cold or sticky. Sometimes it gets in your eyes, and it always feels like it’s time to reapply JUST as you’re about to jump in the water or go kick the ball. So, what’s the deal? Is it really all that important? We get the scoop from Dr. Jeff Yu, a pediatric dermatologist at Massachusetts General Hospital. He’ll help us understand: What is a sunburn? What’s a tan? How does sunscreen work? How do you protect your eyes?

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How did horseshoe crabs get their names? Are they even crabs? And did they really exist before the dinosaurs? Early spring presents a unique opportunity to see these living fossils up close as they scuttle up to the shoreline along the Atlantic coast of the United States to mate and spawn. But Why traveled to Cape Cod to see horseshoe crabs up close. There we met up with horseshoe crab expert Sara Grady, who works for Mass Audubon. We learn all about these arthropods and answer questions like: Can humans eat horseshoe crabs? What’s with the pointy tails? Do they pinch? How long do they live? And what’s so special about their blood?

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Emoji are those little images you can send in text messages to friends and family. Nine-year-old Leila in New Jersey wants to know how they were invented. So in this episode we find out with Jane Solomon, editor at Emojipedia and Paul Galloway of the Museum of Modern Art in New York. We learn what the first emoji looked like, way back in the dark ages of the 1990s and we explore how emoji may be a new trend, but communicating through pictures is a very old tradition. Plus, are emoji…art? Give this episode a 👂to find out!

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Why do walrus look the way they do? Why do they have such long tusks? Do they have other teeth? Do walruses migrate? We learn all about these majestic giants with Adam Ratner of the Marine Mammal Center in Sausalito, California.

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What’s the difference between seals and sea lions? Do seals bark? Are they gray? Do harbor seals live in snowy regions? Why do sea lions eat fish? Why do sea lions fight each other? Seals and sea lions are pinnipeds, fin-footed marine mammals, and we’re learning all about them today with a visit to the Marine Mammal Center in Sausalito, California, where marine biologist Adam Ratner answers all your pinniped questions!

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You can watch the sea lions at San Francisco’s Pier 39 no matter where you live by checking out the live stream at pier39.com/sealions!

What are atoms made of? Why is everything made of atoms? Why are atoms so small? How many atoms are there in the world? How did scientists find atoms if we can’t see them? How do atoms get their color? We learn about atoms with Dr. Ben Still, author of “Particle Physics Brick by Brick” and “The Secret Life of the Periodic Table.” His new book, “How the Universe Works,” will be released in September.

Check out Dr. Ben Still's YouTube channel to learn more about atomic, nuclear and particle physics.

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Further reading:

Cosmic History - NASA

The Secret Science of Atoms

DOE Explains...Nucleosynthesis | Department of Energy

How are records made? How does a record player make sound? Why are we still listening to and buying records when there are so many digital ways to listen to music?! But Why visits Gold Rush Vinyl in Austin, Texas to learn how little plastic beads become brightly colored records that can play back your favorite music or sounds.

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