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How the U.S. Postal Service Works

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The U.S. Postal Service employs about 500,000 people and is responsible for the delivery of mail. Learn more about the United States Postal Service.

How Does Herd Immunity Keep a Country Safe From Diseases?

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Herd immunity relies on the principle of safety in numbers as far as vaccinations go. Find out why herd immunity is an important public health issue.

22 of the Worst Prisons in the World

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These prisons house some of the world's most notorious criminals. But battles rage behind their walls, oftentimes leaving inmates susceptible to torture, disease and even death. These are some of the worst prisons on the planet.

Identify These Monuments!

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The United States is home to thousands of monuments, but can you name the country's first ever monument? Do you know what the Statue of Liberty looks like or where the Colosseum is? If you consider yourself well traveled, put your skills to the test and identify these monuments.

How the California Air Resources Board (CARB) Works

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The California Air Resources Board regulates air quality in the state of California. Find out more about the California Air Resources Board in this article.

Can You Name These Countries With Mostly Red Flags?

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Red for valor. Red for bravery. Red for life, for passion, for blood and for honor. Sometimes red is even for luck. Countries all around the world use red in their flags, so how many do you think you can identify? Run this quiz up the flagpole and see who salutes!

The Eastern Indigo Snake Lives in Gopher Tortoise Burrows

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The eastern indigo snake takes advantage of a unique shelter that provides much-needed protection to the endangered species and its young.

How Poker Works

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Once a game reserved for gun-wielding tough guys in smoke-filled back rooms, poker has become the mainstream. Now there are weekly poker games in homes all over the United States. Learn how to play poker.

What Is Zionism and Is It Fueling the Palestinian-Israeli Conflict?

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Nearly any discussion around the Israeli-Palestinian conflict will include the word Zionism. But what does it even mean, and how has Zionism changed over the course of history?

Can You Score 27/35 on This Difficult World Geography Quiz?

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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!

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