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How Prop-driven Cars Work
auto.howstuffworks.com/prop-driven-car.htm
A propeller-driven car is simpler than modern autos, but much more dangerous for driver and pedestrians. Read about prop-driven cars at HowStuffWorks.
Can You Score 27/35 on This Difficult World Geography Quiz?
play.howstuffworks.com/quiz/difficult-world-geography-quiz
You Ghana love this! We just know it! The ultimate world geography quiz just for you! Andes let's see how well you do! Aim high! But you better know your geographical features, capitals and landmarks found all over the globe!
How Many States Are in the U.S.A.?
history.howstuffworks.com/american-history/how-many-states-usa.htm
The U.S. comprises states, territories and commonwealths. So how many states are in the U.S.A.?
The Ultimate Moon Quiz
play.howstuffworks.com/quiz/moon-quiz
Wolves supposedly howl at it, a fairy tale claims a cow once jumped over it and legends say if you look hard enough, there's a man in it. Yes, the moon has a prominent place in popular culture, but there's a lot you might not know about Earth's little orbiting friend. Why doesn't it have soil? Why is its gravity so important? And are we really thinking of going back soon?
What Is the World's Shortest River?
science.howstuffworks.com/environmental/earth/oceanography/worlds-shortest-river.htm
Ever wondered what's the difference between a river, a stream, a brook and a tributary?
Were U.S. Interstates Really Designed as Runways?
science.howstuffworks.com/engineering/civil/were-u-s-interstates-really-designed-as-runways.htm
Is 1 mile out of 5 on U.S. interstates really supposed to be straight so that planes can land on them in an emergency? Find out the truth about this long-held urban legend.
Arizona's Grand Falls Gushes to Life Again
science.howstuffworks.com/environmental/earth/geology/grand-falls-arizona.htm
Arizona isn't all desert. Take Grand Falls, aka "Chocolate Falls." It is dry most of the year, but when it rains, this waterfall pours.
Why do wildebeests spend their whole lives migrating in a circle?
animals.howstuffworks.com/mammals/wildebeest-migration.htm
Wildebeest migration involves nearly one million wildebeests walking 1,000 miles in search of food. Read about wildebeest migration, an arduous trek.
Can your car tell you when the light's about to change?
auto.howstuffworks.com/can-your-car-tell-you-when-light-will-change.htm
Can your car tell you when the traffic light is ready to change? Learn about Audi's Project Traffic Light Online system at HowStuffWorks.
The Drone Quiz
play.howstuffworks.com/quiz/drone-quiz
These tiny flying machines are everywhere - even carrying packages and pizzas. How much do you know about drones? Take this quiz to find out.