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Porcupine quills are the main source of defense for these prickly rodents. Learn how porcupine quills are impaled into predators and clueless pets.

Light attracting sharks is a theory that suggests sharks are drawn by bright, shiny, yellow and light-colored objects. Learn about light and sharks.

Just how far can the human eye see? There's no exact formula to figuring it out, but we do have an idea.

Fun Physics Activities for Kids teach physics basics to future Einsteins using ordinary playground equipment. Learn fun physics activities for kids.

Hiccups are those annoying, involuntary fits that make it nearly impossible to carry on a conversation. Find out how hiccups work.

Should men shower before a workout? Visit Discovery Health to learn if men should shower before a workout.

Moisturizing gloves can do wonderful things for your hands. Visit HowStuffWorks to learn all about moisturizing gloves.

Want to know how to moisturize your elbows? Visit HowStuffWorks to learn how to moisturize your elbows.

Treating underarm ingrown hairs can be difficult. Visit HowStuffWorks to learn about treating underarm ingrown hairs.

Ever wonder what your skin age is? Visit HowStuffWorks to learn more about your skin age, and what you can do to improve it.

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