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How Does Noise Cancelling Work

electronics.howstuffworks.com/gadgets/audio-music/noise-canceling-headset.htm

Noise-canceling headsets help drown out external noise so you can hear your calls clearly. Learn about the technology behind noise-canceling headsets.

How do ducks float?

animals.howstuffworks.com/birds/duck-float.htm

To understand why ducks float, you have to know a little about buoyancy, but that's not the sole principle at work. Learn why else ducks float.

Should we be worried about the dead zone in the Gulf of Mexico?

science.howstuffworks.com/environmental/earth/oceanography/dead-zone.htm

The Dead Zone is a vast area off the Gulf of Mexico, larger than several U.S. States, that is deadly to marine life. Learn more about the Dead Zone.

Heart Pictures

health.howstuffworks.com/human-body/systems/circulatory/heart-pictures.htm

Take a look at these heart pictures to learn about the different parts of the heart and more. See our heart pictures to learn more.

10 Cobra Snake Species to Keep Out of Striking Distance

animals.howstuffworks.com/snakes/cobra-snake.htm

Cobras are some of the most venomous snakes on the planet, also known for their intimidating hoods and swift strikes. But while their venom and striking power make them feared by many, the role of the cobra snake in ecosystems is invaluable, from controlling rat populations to maintaining a balance among predators.

Why Should You Install a Cold Air Intake?

auto.howstuffworks.com/why-install-cold-air-intake.htm

A cold air intake is an inexpensive modification you can add to your engine that will give it more power. But what does it actually do?

Goodbye Columbus — Hello Indigenous Peoples Day

people.howstuffworks.com/culture-traditions/holidays-other/indigenous-peoples-day.htm

More states are replacing Columbus Day with Indigenous Peoples Day. What's prompted the switch and how you do celebrate it?

How Water Works

science.howstuffworks.com/environmental/earth/geophysics/h2o.htm

Water is the most essential element to life on Earth. Learn about water, the properties of water and find out how the water cycle operates.

What's a walk score?

science.howstuffworks.com/environmental/green-science/walk-score.htm

A walk score is a measure of your neighborhood's walkability. Learn about what a walk score is and find out how the Web site Walk Score rates your walkshed.

How Does a Hippo Make Its Own Sunscreen?

animals.howstuffworks.com/mammals/hippo-sunscreen.htm

Hippo sunscreen is actually the thick sweat that hippos produce to protect their skin from the sun. Learn why red hippo sunscreen is such powerful stuff.

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