Right Now in BrainStuff

BrainStuff: How Does LASIK Work?

Jonathan Strickland explains the process and risks of LASIK surgery, from preoperative exams, to lasers in your eyes.

Some AC-powered smoke detectors are wired to communicate with each other. So when one unit is triggered, all of the units go off. Find out how this intercommunication works in this episode.

BrainStuff: How (And Why) Do Cats Purr?

Cats purr for all kinds of reasons, including communication and healing themselves. Cristen explains how purring works and which cats can't do it.

"Damn Fine Dog"

Many accuse the Iditarod of animal cruelty to dogs. But if the organization does its best to protect them is there a bigger problem? Find more on BrainStuff.

Potato chips were invented in 1853 by an American cook named George Crum, and they've been a popular food item ever since. Learn more about George Crum and the evolution of the potato chip in this episode of BrainStuff.

When people get a rash from poison ivy, their bodies are reacting to a chemical called urushiol. Check out this HowStuffWorks podcast to learn more about poison ivy rashes.

BrainStuff: Are Pop Rocks Dangerous?

Did Pop Rocks really blow the door off of a delivery van? Has anyone ever died from eating these popping bits of sugar? The answers might surprise you. Join Josh as he looks into the truth behind the rumors surrounding the surprisingly loud candy.

Mood rings claim to reflect changes in your emotional state -- and, in a way, they do. Discover the science behind mood rings in this episode of BrainStuff.

The Personalities of BrainStuff

Meet the hosts, crew and personalities behind BrainStuff.

5 Reasons Not To Get a Pet (Rocket) Raccoon

Despite how cute they are, raccoons don't make ideal pets. Find out why on BrainStuff.

Learn more about the anatomy (and chemistry) behind that popping sound your knuckles make when you crack them in this episode of BrainStuff.

What Happened To "X-Rated" Movies?

In 1990 the MPAA replaced X-rated labels with NC-17. Find out why on BrainStuff.

About page for the BrainStuff video team

If you shone a flashlight beam from Earth, would you be able to see it from the moon? It depends. Find out why -- and get a lesson in how light works -- in this episode of BrainStuff.

Tools that say "drop forged" have been created using a technique called drop forging. Find out how drop forging and several other kinds of forging work, and why drop forging is a sign of a sturdy tool, in this episode of BrainStuff.

A barbeque grill has a push-button lighter that relies on piezoelectricity to generate a spark. Learn more about how piezoelectricity works -- and the kinds of devices that use piezoelectric materials -- in this episode of BrainStuff.

BrainStuff: How Does An Electric Toothbrush Charge Itself?

In this episode Jonathan Strickland tackles how we manipulate magnetic fields for the wireless charging of everything from your toothbrush to even your car!

In this episode of BrainStuff, Marshall reveals three common techniques for measuring the height of tall objects like towers.

When the moon is near the horizon, it appears to be much bigger than when it's high in the sky. But is it really larger? Tune in to find out.

Photochromatic lenses darken when exposed to the sun. Discover where these lenses came from, how they work and why they're commonly referred to as "transition" lenses in this episode of BrainStuff.