Can anyone hear my baby monitor?

I have read that it is possible for people to listen in on baby monitors. Is this true? Can people hear my baby monitor?

How Air Conditioners Work

Air conditioning has fundamentally changed how people experience the world. When it's hot outside, walking into an air-conditioned house is like walking into another season.

How Air Purifiers Work

Americans spend an estimated $250 million annually on air purifiers for their homes, with asthma and allergy sufferers responsible for most of the sales. Learn why people buy air purifiers and how they work.

How Dimmer Switches Work

A regular light switch takes care of "off" and "on." A dimmer switch handles "off," "on" and everything in between. Find out what this clever switch does with electrical current.

How does a fluorescent starter work?

How does a fluorescent starter work?

How Fluorescent Lamps Work

You see fluorescent lighting all over the place -- in offices, homes, stores, dressing rooms. But there's a certain mystery to it. Find out what's going on inside these glowing tubes!

How Grills Work

Ribs, chicken and a lot of BBQ sauce. Steaks, burgers, hot dogs and assorted veggies. Summer is prime grilling season. Ever wonder how these treats get so tasty? We've fired up the grill to find out!

How Home Thermostats Work

It's either too cold or too hot in your house. So, you turn a dial, press a button or move a lever -- do you know what happens after that? Look inside a home thermostat and see how it controls your indoor climate.

How Humidifiers Work

Is the air feeling a little drier in your home? Learn how a humidifier can help make things more comfortable, and even save a little wear and tear on your house by adding moisture to the air. It's surprising how big a difference a little water can make!

How Light Bulbs Work

The light bulb hasn't changed a whole lot in its 120 years -- the original design was just that good. Apparently, you can throw together a filament, a glass mount, an inert gas and a bit of electricity and change the world. Learn what happens when you flip that light switch.

How Liquid Motion Lamps Work

With bright colors and mesmerizing displays, lava lamps have become a popular icon of pop culture. Watch a quick video and read the article to learn more about the history and science behind these groovy liquid motion lamps.

How much ice would I have to store up in the winter in order to air condition my house all summer?

How much ice would I have to store up in the winter in order to air condition my house all summer?

How Relays Work

Powered by electromagnets, a relay is simply a mechanical switch, and you’ll find them all over a typical house or car -- in home appliances, thermostats, and power windows. Find out what these simple components are doing in all your electrical stuff.

How Sewing Machines Work

The sewing machine took a time-consuming, laborious task and made it super fast and easy. Find out what goes on inside this ingenious device (and check out the high-tech upgrades!).

How Tankless Water Heaters Work

The green movement is bringing tankless water heaters to the forefront of the appliance market. They last longer, don't take up much space and give you as much hot water as you want. Is there a catch?