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What Is the Chemtrails Conspiracy Theory?

science.howstuffworks.com/transport/flight/modern/what-are-chemtrails.htm

It's hard to look up in the sky on a clear day and not see a "cloud" trailing from an airplane. They're called contrails, though some refer to them as "chemtrails" and have odd explanations for their existence.

What's the world's cheapest car?

auto.howstuffworks.com/worlds-cheapest-car.htm

The world's cheapest car has been making headlines with a low price of two thousand dollars. Learn more about the world's cheapest car.

How could adding lime to seawater cut atmospheric CO2?

science.howstuffworks.com/environmental/green-science/lime-seawater.htm

Adding lime to seawater could increase the efficiency of the world's oceans as carbon sinks. Learn about adding lime to seawater and carbon sinks.

Mammoth vs. Elephant: Same Family, Different Species

animals.howstuffworks.com/animal-facts/mammoth-vs-elephant.htm

It’s the ultimate throwback face-off: mammoth vs. elephant. These two giants share a lot of DNA, but their differences are buried in the fossil record and written across their anatomy. One is an extinct species, the other still roams Earth’s forests and savannas.

How Much Air Pollution Comes From Cars?

auto.howstuffworks.com/air-pollution-from-cars.htm

You see it every time smoke billows from your car's exhaust pipe. There's no denying that vehicles are major contributors to air pollution.

10 Unusual Items from McDonald's International Menu

money.howstuffworks.com/10-items-from-mcdonalds-international-menu.htm

Our list of unusual McDonald's menu items spans the globe and the palette. Take a global tour with 10 unusual items from McDonald's International menu.

What would nuclear winter be like?

science.howstuffworks.com/nuclear-winter.htm

If the sight of a mushroom cloud burning above the horizon suggests that the nuclear weapon-equipped world might end with a bang, then nuclear winter presents the notion that post-World War III humanity might very well die with a whimper.

Did the Mayan civilization end because of climate change?

science.howstuffworks.com/environmental/green-science/climate-change-end-mayan-civilization.htm

Over the years, many theories have been advanced about why the once-mighty Mayan civilization fell. But a newer one is getting attention: Was it because of climate change?

It Takes a DJ: Healthy Reef Sounds May Lure Fish to Damaged Reefs

science.howstuffworks.com/environmental/earth/oceanography/coral-reef-sounds.htm

If it looks like a party is on, maybe they'll come back. Playing the sounds of a noisy, healthy coral reef can attract important fish species to devastated reef habitats.

15 Largest Cities in North America, Ranked by Population

people.howstuffworks.com/largest-cities-in-north-america.htm

The most populous country in North America (the United States) is also home to some of the largest cities in North America, but the No. 1 spot goes to Mexico City.

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