The World

They are the most notorious species of shark, boasting 3,000 jagged teeth and a bite that kills. See how much you know with this quiz.

Astronauts have a reputation for being the brave and skilled few willing to risk their lives by strapping themselves aboard a rocket and blasting into outer space. How much do you know about this dangerous job?

At its best, the space shuttle is the embodiment of 20th-century scientific progress. At its worst, the shuttle is a symbol of the dangers that come with space travel. Take this quiz to see how much you know about the space shuttle program.

By Maria Trimarchi

How much to you know about this financial capital of the world? Take our Dubai quiz to test your knowledge and learn about lesser-known aspects of Dubai's culture.

They are notoriously savage and bloody when they attack, but behind a sharks' vicious reputation is a variety of different shapes, sizes and demeanors. Learn all about the different types of sharks.

Meerkats aren't your typical cute, furry rodents. These desert dwellers are members of close-knit communities where everyone pitches in to look out for predators and teach the young. When they aren't looking for a bite to eat or grooming each other's fur, however, meerkats can be lethally competitive. What is it about these African critters that leaves us so enthralled?

Wolves supposedly howl at it, a fairy tale claims a cow once jumped over it and legends say if you look hard enough, there's a man in it. Yes, the moon has a prominent place in popular culture, but there's a lot you might not know about Earth's little orbiting friend. Why doesn't it have soil? Why is its gravity so important? And are we really thinking of going back soon?

A famous slogan claims that a diamond is forever. While these precious stones symbolize love and glamour for millions of couples, there's a lot about nature's most famous jewel you might not know.

An MRI machine is more than just a big, claustrophobia-inducing tube. How much do you know about what's going on inside -- or what's going on inside your body while you're in there?

Your credit score plays a large part in whether you can buy a house or car. In certain circumstances, it even affects whether you can get a job. But where does the number come from?

If your phone talks through a wireless earpiece and your computer sends songs to speakers across the room, Bluetooth is probably behind it. But what's behind Bluetooth?

This ocean area has a reputation for devilry and danger. How much do you know about the Bermuda Triangle? Find out with our Bermuda Triangle Quiz.

By Nathan Chandler

In line at the corner deli, weaving through traffic, right next to you at a movie theater ... cell phones are everywhere. But are they really that different from walkie-talkies?

You can find batteries under the hood of your car, inside a TV remote -- even within hearing aids. Batteries were invented nearly two centuries ago, and they keep getting more sophisticated. But how well do you know what's at work inside these cans of chemicals?

Electric motors are inside all kinds of ordinary devices, using a power source to make motion. So what makes the motor go 'round?

With the constantly fluctuating price of gasoline, more people are looking into hybrid cars. But it's a good idea to know what you're getting into before purchasing one. Take the hybrid car quiz and see how much you know about them.

If you find yourself locked out of your house, you might be tempted to learn your way around a lock pick. But while the theory is easy, getting a lock to open without a key is a little harder.

Not long ago, most Americans associated tattoos with sailors, bikers and sideshow artists. But tattoos have become more popular in recent years. What does it take to get an image under your skin?

Wireless networks are easy to set up and inexpensive. They're also unobtrusive -- unless you're on the lookout for a place to use your laptop, you may not even notice when you're in a hotspot. But as you’ll find out in this quiz, there’s a lot more to them than meets the eye.

There are a lot of misconceptions regarding sadness and major depressive disorder (MDD). Knowing the differences, causes and treatments can lead to a better quality of life for you or someone you know. So how much do you really understand about the condition?

By Kevin P. Allen