BrainStuff

Some hair dyes are basically fine-grained paint. But dyes that stick with you for more than a couple weeks physically and chemically change each hair. Learn how with Christian Sager.

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Tattoo machines (sometimes called guns) haven’t changed much since the 1890s because they’re such elegant devices. Tune in to learn how the most common types work.

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What makes a planet ideal for sustaining life?

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The short answer is “no.” Tune in to learn how long it really takes, plus how nuclear weapons led scientists to the solution.

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Scientists have found evidence that plants have senses, memories, and can even communicate with each other. But does this mean they're conscious?

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Christian explains the difference between common types of milk, looking at calories, fat and the rest of their composition.

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Tinnitus is what makes your ears ring after a loud noise. And it's really annoying.

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We all know what an ice cream headache feels like. Christian's here to explain why they happen. It involves temperature (duh), nerves and lots of blood.

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It’s true – some people hear colors, or taste words. But what produces synesthesia?

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It's one of the strangest - and potentially grossest - challenges out there. But what happens when you drink milk? Why does it make you throw up?

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