One grows from the ground and one from the ceiling, but sometimes it's hard to remember which is the stalactite and which is the stalagmite. How do they get there, anyway?
How Cave Diving Works | How Spelunking Works

Somewhere along the way, most of us have heard that we're not supposed to remove the tags from our mattresses or pillows because it violates some kind of law. What gives?
How Sleep Works | How Sleepwalking Works

There may be "water, water everywhere and not a drop to drink," but what if you could substitute ocean water for gasoline? It's a little like alchemy, but could it work?
Alternative Fuel Channel | How Hybrid Cars Work

Oil is a necessity that can keep your car lubricated and running smooth. But what happens if you never change it? And how long can you really go?
How Car Engines Work | How Oil Refining Works

Sure, G.I. Joe's firearm accoutrements are tiny, but this itty bitty gun actually fires rounds. What is it, and why is it illegal to import into the United States?
How Revolvers Work | How Shotguns Work

Practiced pickpockets are nimble and intelligent -- and they look just like everyone else. You'll be amazed to learn how easily they could take your hard-earned dollars.
How Burglar Alarms Work | How Lock Picking Works

The civilization of the ancient Greeks grew up around the Aegean Sea, spread through the Greek mainland -- and would go on to form the basis of Western culture. Find out more.
Did the ancient Greeks get their ideas from the Africans?

When most of us hear the word "cult," we see a bunch of brainwashed zombies, mass murders and a burning compound in Waco, Texas -- not a pretty picture. But is it a true picture?
How Fear Works | How Hypnosis Works

Tracking gas prices can feel like a roller coaster ride. They're down a little one month, up the next, before shooting up more than 50 percent in a year.
Can we fuel cars with grass? | How Gasoline Works

They say the grass is always greener on the other side of the fence. Why is that? How can you take your lawn from wilting mess to suburban Eden?
How Mosquitoes Work | How Marijuana Works

Marshall Brain, the original brain behind HowStuffWorks, discusses how Angkor Wat works, the difference between an espresso, cappuccino and a latte, and global warming.
Podcast: How Red Eyes in Photographs Work