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Our 100th episode! What’s the big deal?

In this milestone of an episode, we ask why people seem to love the number 100 so much. We also learn some amazing tricks involving the number 100 and fan favorite Gungador goes from Most Epic Fighting Battle Realm to a much more challenging setting: high school.

Meet Sandy, the left-handed mutant snail

Alex Bairstow took this photo of Sandy, an unusual snail from California. (Courtesy of the Natural History Museum of Los Angeles County)

For humans, being left-handed or right-handed can definitely affect the way we experience life. Usually, that mismatch is just a minor nuisance — but sometimes, sidedness can change the future of an entire species, as is the case for Sandy.

Dolphins vs. Octopuses: Showdown in the sea!

Which are cooler: Dolphins or octopuses?

We’re asking you to decide which animal reigns supreme. Is it the eight-armed, three hearted, shape-shifting octopus? Or the speed-swimming, echolocating, super-jumping dolphin?

Dogs: What’s the secret of their sense of smell? (Encore)

Freedom, a beagle trained to sniff out bedbugs, on July 26, 2010 in the Queens borough of New York. (STAN HONDA/AFP/Getty Images)

If you’ve ever seen a dog, you know they like to sniff — the ground, people, each other’s butts. They like to smell just about everything. But why? We’re digging into the science of smell and how dogs are able to decode things we can’t even begin to imagine. Plus a brand new Moment of Um: How do bees make honey?

Mary Shelley and the science of Frankenstein

A statue of Frankenstein's monster in Geneva.( FABRICE COFFRINI/AFP/Getty Images)

As we celebrate the 200th anniversary of the novel’s publication, we look at how Mary Shelley was inspired by science and how the lessons of the book still resonate with the scientific world today.

Super-size-asaurus: How did dinosaurs get so big?

A Brachiosaurus dinosaur herd pass through a dry desert area in the Jurassic Period of North America.

Ancient dinosaurs were some of the biggest creatures to ever stomp the Earth. But how and why did they get so giant?

Mysteries of the universe: Expansion and gravity (Encore)

This huge Hubble Space Telescope mosaic, spanning a width of 600 light-years, shows a star factory of more the 800,000 stars being born. The stars are embedded inside the Tarantula Nebula. (Photo credit: NASA, ESA, and E. Sabbi/STScI)

In this episode we ponder some big questions from Brains On listeners about the vastness of space.

The nerve! Electricity in our bodies

Your body is making and using electricity all the time — but how do we do it? We’ll take a look at how bioelectricity helps our brain sends signals and our hearts pump blood. And we’ll learn about some amazing animals that use electricity in weird and wild ways.

Charged up! The science of batteries

Batteries are everywhere — they’re in our phones, our computers, our cars, our toys. But how do they work? To find out, we talk to a scientist who’s making really big batteries to store renewable energy, another who’s working on really small ones to power our phones, and we play in a park with a dog.