BrainStuff

In the United States, 17.6 million American lack access to healthy food because there aren't any grocery stores or other establishments that sell fresh food in their area. Learn about food deserts and how we can fix them in this episode of BrainStuff.

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Large rockets are great at getting delicate equipment (and people) into space, but at a huge financial cost. Learn about some of the potential alternatives to ground-launched rockets in this episode of BrainStuff.

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Dogs are pretty much guaranteed to find the smelliest stuff to roll in -- but why? Learn what may be behind this gross instinct in today's episode of BrainStuff.

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When you freckle or tan, your skin is trying to protect you from damage. Learn how it works in this episode of BrainStuff.

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Hundreds of new religions pop up every year, but only a few survive and become widespread. Learn why some religions have staying power while others don't in this episode of BrainStuff.

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Tattoo machines (sometimes called tattoo guns) haven’t changed much since the 1890s because they’re such elegant devices. Learn how the most common types work in this episode of BrainStuff.

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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 in this episode of BrainStuff.

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An ancient Egyptian pregnancy test has been found to work with about 70% accuracy. Learn how it works in this episode of BrainStuff.

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Some parents and advocacy groups recommend against allowing children to play with toys that resemble weapons, like toy guns. But is there any science to back that up? Learn about play, parenting, and aggression in this episode of BrainStuff.

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Smells seem to disappear after a while because our brains lie to us. Not maliciously -- they think they're helping. Learn about olfactory adaptation in this episode of BrainStuff.

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