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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.

Types of Bears

animals.howstuffworks.com/mammals/types-of-bears.htm

The brown bear, the grizzly and the Kodiak bear are all of the brown bear species. Learn all about the brown bear at HowStuffWorks.

Diet Coke vs. Coke Zero: Is There Actually a Difference?

recipes.howstuffworks.com/diet-coke-vs-coke-zero.htm

Which gets your vote in the great Diet Coke vs. Coke Zero debate? The labels say the differences are slight, but fans will say the diet sodas are worlds apart.

Why Were Fake Eyelashes Invented?

people.howstuffworks.com/culture-traditions/body-art/why-were-fake-eyelashes-invented.htm

In the world of beauty, where people have long coveted voluminous lashes, the invention of false eyelashes revolutionized how individuals enhance their eyes. But why were fake eyelashes invented in the first place? Let's look at the history behind these tiny hairs and people's fascination with them.

How to Use the Mnemonic 'SOHCAHTOA' in Trigonometry

science.howstuffworks.com/math-concepts/sohcahtoa.htm

The mnemonic device SOHCAHTOA helps budding mathematicians remember the trigonometric functions sine (sin), cosine (cos) and tangent (tan), which they need to solve for triangles' missing sides and angles.

Using Synthetic Division to Save Time in Calculus and Algebra

science.howstuffworks.com/math-concepts/synthetic-division.htm

In algebra and calculus, a polynomial function is used to chart out graphs and waves with much more complexity than a simple linear factor. Polynomial division is sometimes required to factor them, and cut them up into chunks that we humans can better understand.

'Cocaine Sharks' Make Waves Off Coast of Brazil

animals.howstuffworks.com/fish/sharks/cocaine-sharks.htm

Ever wondered what sharks might find in their waters besides fish? Turns out, some Brazilian sharpnose sharks (Rhizoprionodon lalandii) have been swimming in some rather strange seas - ones laced with cocaine.

The Slender Parrot Snake Can Grow to More Than 5 Feet Long

animals.howstuffworks.com/snakes/parrot-snake.htm

Today, we're going to talk about a snake that glides through the trees of Central and South America: the parrot snake: These slender, vibrant creatures might look delicate, but they're expert hunters with some cool adaptations that help them thrive in the tropical forests.

Identifying Red and Black Snake Species

animals.howstuffworks.com/snakes/red-and-black-snake.htm

In North America and other parts of the world, you may encounter a red and black snake along your hike and wonder if you're dealing with a venomous snake species or something like a harmless milk snake.

Sidewinder Snake Navigates Loose Sand With Special Scales

animals.howstuffworks.com/snakes/sidewinder-snake.htm

Let's talk about one of the coolest movers and shakers in the desert world: the sidewinder snake. Known for its unique way of getting around, this snake has mastered the art of slithering across scorching desert sands in the hottest places on Earth.

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