The World

Without memory, computers wouldn't be able to store data in any way. How much do you know about computer memory?

Whether you know it or not, you probably use gears several times each day. Gears are used in a wide variety of mechanical devices including wrist watches, bathroom scales, washing machines and, of course, automobiles.

It's no secret -- your car needs fuel. Everyone knows that you put fuel into the tank to keep the car running. But have you ever stopped to think about how the fuel gets from the fuel tank into your engine? Take our quiz to find out how much you know about fuel injection systems.

Everyone knows that gas prices are skyrocketing, but how much do you know about where your gasoline is coming from? Do you know where the money that you spend on gasoline is actually going? Where can you find the cheapest gasoline in the world? What about the most expensive? Take our quiz to find out how much you know about gas prices.

Who hasn't fantasized about throwing someone's cell phone out the window after unwillingly hearing way too much of his or her conversation? Cell-phone jammers silence these yappers and all other calls, obnoxious or otherwise, in a given area. But are they legal?

Digital cameras have helped make photography easier and faster for millions of people, but how much do you really know about them? Take our quiz to find out!

Hydraulic equipment is amazing in its strength and agility. From common backyard machines to the huge machines you see on construction sites, hydraulics make quick work of even the most difficult tasks. How much do you know about hydraulic machines?

Photography began as a curiosity but has evolved into one of the world's most popular hobbies. Find out how much you know about cameras by taking our quiz.

Clutches are in many things that you see or use everyday. The car you drive is just one example. If you drive a manual transmission car, you may be surprised to find out that it has more than one clutch. If you drive an automatic transmission car, well, you have clutches, too. How much do you know about clutches?

They may look similar from the outside. But there are many significant under-the-hood differences between an electric-powered car and a car that makes use of an internal combustion engine. How much do you know about electric cars?

Automobile ignition systems rely on perfect timing. A simple spark, when delivered at precisely the right moment, can mean the difference between a smoothly running, powerful engine that operates cleanly and an engine that runs rough, lacks power and produces unnecessary emissions. Let's get your motor running.

Recession is one word you might be tired of hearing -- especially if you have any money in the markets. Just the same, it's still good to know what's what where your wallet is concerned. So put your money where your mouth is, and take this quiz.

As the saying goes, home is where the heart is. But just how does one go about building a home in the first place? Find out some fun facts about this detailed process by taking the quiz.

Catalytic converters are amazingly simple devices that have proven to be highly effective at reducing harmful emissions produced by car engines. How much do you know about catalytic converters?

Buying a car is often perceived to be a difficult and confusing process. If you take the time to learn what you need to know before purchasing a vehicle, the entire process is relatively simple and straightforward. So, how much do you know about buying a car?

What looks like a battery, has two terminals like a battery and stores electrons like a battery? Capacitors can store and release electrical energy, but don't replenish their supply. How do capacitors work, and what tools rely on them?

The biodiesel quiz will test your knowledge about biodiesel components, biofuel history and biodiesel pros and cons. Take the quiz and see how much you know about how biodiesel works.

The Bugatti quiz will test your knowledge of the Bugatti Veyron and how it works. What do you know about this amazing vehicle? Take the Bugatti Quiz and find out (and learn some cool facts along the way!).

The air and fuel mixtures that power your car's engine are controlled by valves that open and shut. The essential camshaft rotates and instigates the valve movement. But how exactly does this crucial engine part work? See how well you can shift mental gears and take the camshaft quiz.

The suspension of a car is actually part of the chassis, which comprises all of the important systems located beneath the car's body. Suspension systems have been smoothing out bumpy rides for centuries -- first in carriages, now in cars. How much do you know about car suspensions?

If you're reading these words, you've benefited from the operations of a router -- probably several in fact. Learn more about these mysterious mechanical manipulators that control network navigation by taking this quiz.

Oil drilling, though difficult, is pretty simple when compared to oil shale extraction. Getting oil shale, solidified oil trapped inside rock, to the surface is currently more expensive and environmentally harmful than conventional drilling. How much do you know about this potential fuel source trapped beneath the Earth's crust?

Imagine how convenient it would be if two-thirds of the Earth's surface was covered with a readily available, nonpolluting fuel source. With the discoveries being made in regards to salt water fuel, you may not have to imagine much longer. In 2003, John Kanzius serendipitously discovered a way to burn salt water. How would salt water fuel impact the world?

Do you remember when Web pages were in basic HTML and there was no such thing as online social networking? Things have changed fast, but do you know where the Web is going now? Take our Web 3.0 Quiz to learn about the future of web technology.

After spending your cash and withstanding the needles, you've decided to have that tattoo removed. Bur how much do you really know about tattoo removal?