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Why Do Some U.S. Bills Have a Star at the End of the Serial Number?

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Most U.S. currency contains a serial number that ends with a letter, but some end or begin with a star instead. What does the letter stand for? What is the significance of the star?

What's the Meaning of 420 and Why Is 4/20 Weed Day?

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Nope, it's not the police code for marijuana possession. It has a much cooler origin story. Find out about the meaning of 420.

How Squatting Works

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Squatting is setting up camp on land or moving into an unused building. Learn what laws protect squatters and how squatting affects culture.

How Diesel-fueled Hybrids Work

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New diesel engines are clean, powerful and reliable, so wouldn't it be great if an automaker built a diesel hybrid? Learn about diesel hybrid vehicles here.

How Interest Rates Work

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Interest rates are basically the price we pay for living in a world that relies heavily on credit and debt. Find out how interest rates work in this article.

How the Minerva Project Works

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What's the next revolution in college education? Find out how the Minerva Project works at HowStuffWorks.

How Amazon Same-day Delivery Works

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The Amazon same-day delivery service aims to get your package to you in no time at all. Learn how Amazon same-day delivery works.

Bridge Pictures

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Bridge Pictures give you a glimpse of some of the most amazing engineering accomplishments. Check out this collection of bridge pictures.

How Many Cities Have a Ban on Plastic Bags?

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It's probably more than you think. Learn more about how many cities have a ban on plastic bags.

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