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Can You Answer All of These Questions an Auto Mechanic Should Know?
play.howstuffworks.com/quiz/can-you-answer-these-questions-an-auto-mechanic-should-know
Every car fan seems to think they are an all-around automotive expert, but there are a lot of things that car junkies may not know about auto mechanics. Prove you know cars by answering these questions an auto mechanic should know.
The Most Powerful Passport Comes From a Nation State
people.howstuffworks.com/most-powerful-passport.htm
Want to know which travel documents unlock the most doors around the world? Every year, the Henley Passport Index ranks passports based on how many destinations their holders can visit without needing a prior visa.
Where is the Earth's carbon stored?
science.howstuffworks.com/environmental/green-science/earth-carbon-stored.htm
No one would blame you if you're sick of hearing about carbon. Every day it seems there are news stories about rising carbon levels, carbon emissions and even the search for new carbon-based life forms
How NASCAR Race Cars Work
auto.howstuffworks.com/auto-racing/nascar/nascar-basics/nascar.htm
The original NASCAR races were run on dirt tracks in regular street cars. Today, almost every piece of a NASCAR race car is handmade. Get a behind-the-scenes look at how these amazing machines come together.
DIY Cat Tree: 5 Steps to Building a Custom Cat Condo
animals.howstuffworks.com/pets/diy-cat-tree.htm
Every cat needs a place to scratch, climb, and perch. Building a DIY cat tree gives your feline friend a custom space to do just that — and it's way cheaper than buying one from pet stores.
How Viagra Works
science.howstuffworks.com/viagra.htm
Viagra is one of the best-known drugs of all time. Nearly every adult in America has heard of the drug and can tell you what it does. Find out how this high-profile medication works its magic.
10 Pink Gemstones That Charm Beyond Valentine's Day
science.howstuffworks.com/environmental/earth/geology/pink-gemstones.htm
Pink gemstones blend science and sparkle like few other minerals. Whether you're drawn to the feminine hue for its metaphysical properties or just its stunning aesthetic, there's a pink stone for every style and budget.
How Kin Selection Works
science.howstuffworks.com/life/evolution/kin-selection.htm
We're used to taking the phrase "survival of the fittest" to mean it's an "every man for himself" world. But some animals (like worker bees) sacrifice themselves to ensure their species lives on. Why would they do this?
Can You Identify These MLB Teams From an Image of Their Ballpark?
play.howstuffworks.com/quiz/can-you-identify-these-mlb-teams-from-an-image-of-their-ballpark
One of the great things about baseball is every ballpark has its own quirks and unique dimensions. Are you a big enough baseball fan to identify all 30 parks from a photo? Start this quiz to find out!
Can You Identify These Candy Bars From an Image?
play.howstuffworks.com/quiz/can-you-identify-these-candy-bars-from-an-image
Sometimes you feel like a nut ... sometimes you can name every candy bar ever made. It's time to test your sweet skills and see if you can identify these candy bars from an image.