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Why do people collect shark teeth?

animals.howstuffworks.com/fish/sharks/shark-teeth.htm

Collecting shark teeth is a hobby for many people, but why do we do it? Learn why collecting shark teeth is like gathering up pieces of history.

10 Educational Video Games Your Kids Will Love

electronics.howstuffworks.com/family-tech/tech-for-kids/10-educational-video-games-your-kids-will-love.htm

Educational video games your kids can love as much as regular games. See 10 educational video games your kids will love.

How Sailing Works

entertainment.howstuffworks.com/sailing.htm

Sailing has been a popular recreational sport since the 17th century. Learn about different types of sailing, sailing terms and sailing safety.

How a Pneumatic Tube Works

electronics.howstuffworks.com/everyday-tech/pneumatic-tubes.htm

That tube you put your check or deposit slip in at the bank drive-up window is called a pneumatic tube. This was cutting edge 19th-century technology and is still in use today.

How a Weather Balloon Works?

science.howstuffworks.com/nature/climate-weather/meteorological-instruments/weather-balloon.htm

Have you ever wondered how weather stations gather all of their data? Even though technology for predicting the weather has improved, simple weather balloons do a lot of the hard work every day.

How Salt Works

science.howstuffworks.com/innovation/edible-innovations/salt.htm

Not only do we need to consume salt, we also need it for a variety of nonfood uses. But if it's so important, why do health organizations recommend that we closely watch our intake? Apparently, there can be too much of a good thing. Learn what happens when we overload on salt or get too little of it.

The Apex Predator List: Life at the Top of the Food Chain

animals.howstuffworks.com/animal-facts/apex-predator-list.htm

Apex predators attract a special kind of fascination; also called "super predators," they sit at the top of the food chain, unquestionably the most dominant members of the animal kingdom.

Can You Score 27/35 on This Difficult Animal Quiz?

play.howstuffworks.com/quiz/can-you-score-2735-on-this-difficult-animal-quiz

People are strange, and so are animals! There are some that are really weird, and then there are those you consider as ordinary, yet they have their own brand of strangeness in ways you didn't know. See if you can detect these quirky animal kingdom facts in this difficult animal quiz!

How the Metric System Works

science.howstuffworks.com/metric-system.htm

Ever heard of a little unit called a femtometer? Can you tell us how much you weigh -- in petagrams? We know you can't, so hurry up and start reading. We have work to do.

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