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How Much Does a Semi Truck Weigh?

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So, how much does a semi truck weigh? We'll explore what a semi truck weighs and how weigh stations work.

How Much Fuel Does an International Plane Use for a Trip?

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Although the amount of fuel may seem high, when you do the math, it's actually not so bad.

How Much Water Is on Earth?

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Water is one of the most abundant substances on the planet. About 70 percent of our planet is covered by oceans, but just how much water is there on Earth?

How Much of Our Brain Do We Use? Debunking the Myth

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It doesn't exactly seem like something the human body would do, let a large portion of itself go to complete waste. Is it true that most of your brain is on permanent hiatus?

How Much of the Ocean Has Been Explored? Shockingly Little!

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You might be surprised at how little of the world's oceans scientists have investigated.

How Multitasking Works

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You may think you're skilled at 'multitasking,' but chances are you aren't working on two things at the same time. Learn more at HowStuffWorks.

They stick around long after death and compete with the likes of Dracula, Frankenstein's monster and the Wolfman as one of the great figures of classic horror movies. Are you brave enough to unravel the history of these real-life, tangible ghosts?

How Mustard Gas Works

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Mustard gas is a chemical warfare agent developed during World War I. Learn how mustard gas affected soldiers and armies used mustard gas.

How NASA Planetary Protection Works

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What if your job were to protect life in the galaxy at all costs? Read about NASA's Planetary Protection program at HowStuffWorks.

How NASA Works

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When most people think of NASA, they probably think of astronauts and the Kennedy Space Center. But there's a whole lot more to this 60-year-old organization.