BrainStuff

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. Learn...

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.Learn...

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. Learn...

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.Learn...

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

An ancient Egyptian pregnancy test has been found to work with about 70% accuracy. Learn how it works in this episode of BrainStuff.Learn more about advertising on the HowStuffWorks podcasts at...

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,...

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,...

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. Learn more about...

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.Learn more about...

Medical marijuana is now FDA-approved for some uses even though it's still illegal federally. Some researchers and journalists, including Dr. Sanjay Gupta of CNN, believe it could help solve the...

Medical marijuana is now FDA-approved for some uses even though it's still illegal federally. Some researchers and journalists, including Dr. Sanjay Gupta of CNN, believe it could help solve the...

Who were the first people to drink lemonade? How did it turn pink? Learn the folklore behind lemonade in this episode of BrainStuff.Learn more about advertising on the HowStuffWorks podcasts at...

Who were the first people to drink lemonade? How did it turn pink? Learn the folklore behind lemonade in this episode of BrainStuff. Learn more about your ad-choices at...

Who were the first people to drink lemonade? How did it turn pink? Learn the folklore behind lemonade in this episode of BrainStuff. Learn more about your ad-choices at...

Who were the first people to drink lemonade? How did it turn pink? Learn the folklore behind lemonade in this episode of BrainStuff.Learn more about advertising on the HowStuffWorks podcasts at...

The gunk that builds up at the inner corners of our eyes is residue of our eyeballs' protective coatings. Learn what it’s made of and why it turns to sand overnight in this episode of BrainStuff....

The gunk that builds up at the inner corners of our eyes is residue of our eyeballs' protective coatings. Learn what it’s made of and why it turns to sand overnight in this episode of...

In case you ever get stranded in the wild without an obvious source of fresh water, learn a few things you can do to collect some in this episode of BrainStuff. Learn more about your ad-choices at...

In case you ever get stranded in the wild without an obvious source of fresh water, learn a few things you can do to collect some in this episode of BrainStuff.Learn more about advertising on the...