How CAT Scans Work - CAT scans take X-ray imaging to a whole new level. Find out how a CAT scan machine uses "slices" to form a 3-D computer model of a patient's insides.
How Christmas Lights Work - If you've ever been standing in your living room with a strand of Christmas lights that just won't work, you'll love this article! Learn what's going on so you can fix it yourself!
How Fiber Optics Work - Fiber-optic lines have revolutionized long-distance phone calls, cable TV and the Internet. Learn how optical fibers are made and how they transmit light waves!
How Fire Works - Fire is one of mankind's greatest tools -- and also one of its worst enemies. Learn what fire is, how it starts and why it spreads so effectively.
How Fluorescent Lamps Work - Fluorescent lighting is one of the most widely used techologies today -- it's in offices, homes, dressing rooms... Find out what's going on inside those glowing tubes!
How Gas Lanterns Work - Do you have one of those crazy lanterns that burns white gas? Find out how they work, and why they need to have radioactive mantles!
How Instant Film Works - Before digital cameras, you needed instant film to get instant pictures. Find out how Polaroid and other instant cameras give you the image in a snap!
How Laser Printers Work - How can a laser beam draw and write on paper? It's really pretty amazing -- find out how laser printers use light and static electricity to print documents.
How Lasers Work - Lasers are used in all sorts of devices, from CD players to dental drills. Learn about the various types of lasers and how they generate such powerful, coherent light!
How Light Bulbs Work The light bulb hasn't changed a whole lot in its 120 years -- the original design was just that good. Learn how this amazing, amazingly simple device creates light at the flip of a switch.
How Light Emitting Diodes Work - Light emitting diodes do lots of different jobs -- form numbers on digital clocks, send data from remote controls, illuminate watches... Find out how a diode produces light!
How Light Microscopes Work - The human eye misses a lot -- enter the incredible world of the microscopic! Explore how a light microscope works.
How Light Sticks Work - Light sticks are huge these days! They're at parties, concerts and filling the streets on Halloween. Learn how these light sources glow!
How Light Works - Light is so common that we don't even think about it, but it is essential for vision and it is the energy source that keeps planet Earth alive -- learn how light works and how photons are generated!
How Luminol Works - You know on crime shows when they spray some stuff on a "clean" carpet and suddenly -- blood stains! This crime scene tool actually exists. Find out how luminol reveals the blood.
How Mirages Work - You're driving down the road on a sunny day, and you see a puddle of water coming up. You look again and it's gone! What happened? Learn what causes different kinds of mirages.
How Night Vision Works How can you see someone standing over 200 yards away on a pitch-black night? Learn how night-vision goggles work.
How Rainbows Work - Rainbows are easily one of nature's most beautiful effects. Have you ever wondered how the colors end up in seemingly perfect bands? Find out exactly how a rainbow is produced.
How Solar Cells Work - Solar cells use sunlight to produce electricity. But what happens on a cloudy day? Learn all about solar cells and what it would take to power your entire house with solar energy.
How Solar Eclipses Work - Solar eclipses don't happen very often, but when they do they are amazing to watch! Learn how these rare occurrences work!
How Solar Yard Lights Work - If you've ever thought about lighting your yard or walkway, solar is the easiest way to go -- no wires! Learn how solar yard lights gather power during the day so they light up at night.
How Stars Work - When you look up at night and see thousands of stars, have you ever wondered what you are looking at? Learn what stars are and how they live and die!
How Sunburns and Sun Tans Work - There is something mysterious about the sun and skin -- read this article to learn if the sun is right for you!
How Sunglasses Work - For some of us, summer is already here -- time to break out the sunglasses. But are they really protecting your eyes? Find out if those $10 sunglasses are as good as the high-cost ones.
How Telescopes Work - A telescope can be as simple as a $100 amateur scope or as complicated as the Hubble space telescope. Learn how telescopes work and what to consider if you are thinking about buying one!
How the Sun Works - The sun is one of those things we take for granted, but life would be impossible without it! Learn all about it!
How X-Rays Work - X-ray machines seem to do the impossible: They see straight through clothing, flesh and even metal! Learn about the simple science behind this apparent magic trick.