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What human activities increase carbon dioxide in the atmosphere?

science.howstuffworks.com/environmental/green-science/human-activities-increase-carbon-dioxide.htm

Although a certain amount of carbon dioxide (CO2) occurs naturally in the Earth's atmosphere, there are several human activities that increase levels of the greenhouse gas.

You'll Never Guess What Company Makes the World's Most Tires

entertainment.howstuffworks.com/lego-tires.htm

There are a ton manufactured every year across the world. So what company makes the most? You'll probably be shocked to find out.

Ancient Egyptian Pregnancy Test Survived Millennia Because It Worked

science.howstuffworks.com/life/biology-fields/ancient-egyptian-pregnancy-test-survived-millenia-because-it-worked.htm

A strange, but surprisingly accurate, ancient Egyptian pregnancy test survived for millennia and was spread around Africa and Europe because it was just that effective.

London, Paris and Beyond: The European Capitals Quiz

history.howstuffworks.com/european-history/european-capitals-quiz.htm

Yeah, yeah, everyone knows that Emily just loves Paris. But what about some of the other 40-plus capital cities in Europe?

Where in the World Are You? Take our GeoGuesser Quiz

entertainment.howstuffworks.com/leisure/online-games/geoguessr-quiz.htm

The world is a huge place, yet some GeoGuessr players know locations in mere seconds. Are you one of GeoGuessr's gifted elite?

What's the Longest Suspension Bridge in the World?

science.howstuffworks.com/engineering/structural/world-longest-suspension-bridge.htm

Until 2022, the longest suspension bridge in the world was in Japan. Now, the 1915 Canakkale Bridge in Türkiye has taken the title

Pacu Fish: The Piranha Cousin With Human-like Teeth

animals.howstuffworks.com/fish/pacu-fish.htm

In 2023, 11-year-old Charlie Clinton from Oklahoma made headlines by catching a pacu - a South American fish known for its human-like teeth - in a pond behind his house, far from its native Amazon habitat.

Can You Identify These 40 Countries By Their Flags?

play.howstuffworks.com/quiz/your-iq-is-146-higher-you-can-identify-these-40-countries-their-flags

It's kind of crazy that national flags carry so much importance and symbolism in one single design. When it comes to the flags of the world, will you take the checkered flag or end up waving a white one? Find out by taking our quiz!

Can You Guess the Country These Foods Came From?

play.howstuffworks.com/quiz/can-you-guess-the-country-these-foods-came-from

Without leaving your desk, we're going to take a culinary trip around the world! You should prepare yourself to be hungry while you tell us where these dishes are from. Can you name as many as you think you can?

What Does the CE Certification Logo Mean?

electronics.howstuffworks.com/everyday-tech/question135.htm

Have you ever noticed the CE certification logo stamped on consumer products and electronics? Find out what this logo says about the product you're buying.

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