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

Are airport screeners whittling figurines with your contraband Swiss Army knife? Follow the trail of your knife as it leaves your pocket and goes on to achieve eBay glory.
How Airport Security Works | How eBay 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

You know what happens when you suck it out of balloon. So if you filled the air with helium, how high would your voice get?
How Helium Balloons Work | How Blimps Work

This cult coffee maker could cost more than your car. But maybe going without wheels wouldn't be so bad if you had the perfect cup of coffee to start your day.
How Coffee Makers Work | How Caffeine Works

Protecting the Earth is serious business for a radical group of environmental and animal activists dubbed eco-terrorists. Why does the FBI consider them a top priority?
How the Sierra Club Works | How Greenpeace 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

You might have noticed one of these cars flexing its powerful engine at a stoplight. Browse through our image gallery to take a look at these classics.
Hybrid Car Image Gallery | Exotic Car Image Gallery

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