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Compression Ratio and Octane Ratings: What You Need to Know

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How do octane ratings and compression ratios relate to each other? Get all the details at HowStuffWorks Auto.

How 3-in-1 Jackets Work

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3-in-1 jackets keep you comfortable year-round. Visit HowStuffWorks to learn all about 3-in-1 jackets.

The Ultimate Food Science Quiz

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Food scientists rely on chemistry, technology and other science skills to figure out the best way to feed a growing population while keeping food healthy, sustainable and delicious.

5 Things You Didn't Know About Your Belly Button

health.howstuffworks.com/human-body/parts/5-things-didnt-know-about-belly-button.htm

HowStuffWorks explores little-know facts about belly buttons, like why there is lint inside and why some people don't have a navel.

Oil Diffusers Make Your House Smell Great, But Are They Safe?

health.howstuffworks.com/wellness/natural-medicine/aromatherapy/oil-diffuser-safe.htm

Burning some essential oils around your home may make it smell really nice. But could there be some side effects you should be worried about?

What Was Really Behind Agatha Christie's Mysterious Disappearance?

entertainment.howstuffworks.com/arts/literature/agatha-christies-disappearance.htm

In 1926, famed crime novelist Agatha Christie went missing for 11 days under very strange circumstances. Even today, questions linger about why she did it.

12 Most Gay-friendly Cities in the U.S. (4 in California)

people.howstuffworks.com/most-gay-friendly-cities-in-the-us.htm

If you are searching for the most gay-friendly cities in the U.S., you are really asking a science-of-people question: Where do laws, culture, and community line up so LGBTQ people can live ordinary lives (or at least as "ordinary" as straight people)?

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