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What is a birch tree pollen allergy?
Some people have allergies to foods, while others are allergic to airborne substances. Learn what a birch tree pollen allergy is in this article.
Do turbochargers help engine performance in high altitudes?
auto.howstuffworks.com/turbocharger-high-altitude.htm
Turbochargers can increase an engine's horsepower and are relatively lightweight. Find out how turbochargers help engine performance in high altitudes, in this article.
How can a tire receive a mud or snow designation?
auto.howstuffworks.com/tire-receive-mud-snow-designation.htm
Some tires are built to handle mud and snow... and some are not. Learn about mud and snow tire designations in this article.
Refined vs. Unrefined Carbohydrates
health.howstuffworks.com/wellness/diet-fitness/information/refined-vs-unrefined-carbohydrates.htm
What are the differences between refined and unrefined carbohydrates? Learn about refined and unrefined carbohydrates at Discovery Health.
Can cat allergies cause a rash?
Cat allergies can result in a number of different symptoms. Learn whether cat allergies can cause a rash in this article.
Can you highlight your hair if you have skin allergies?
A large number of people are allergic to hair dye. Learn whether you can highlight your hair if you have skin allergies in this article.
How Twins Work
science.howstuffworks.com/life/genetic/twin.htm
Twins are unique people who are also eerily similar to each other. Do twins really have ESP? Learn how twinning happens and what types of twins are out there.
How SWAT Teams Work
people.howstuffworks.com/swat-team.htm
A SWAT (Special Weapons and Tactics) team is an elite unit within a police force, used for exceptional situations that require increased firepower or specialized tactics. Find out how SWAT team members train, what gear they use and how they conduct raids.
Taoism and Chi
people.howstuffworks.com/taoism-and-chi.htm
Chi is an important component of Taoism. Learn more about chi as a Taoist concept and see how chi manifests itself in human experience.
10 Things That Aren't Free Speech
people.howstuffworks.com/10-things-that-arent-free-speech.htm
Free speech is a very guarded freedom, but that doesn't mean citizens can say whatever they like with no punishment. Learn more at HowStuffWorks.