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Pain is subjective - what is excruciating to you might be tolerable to me. Which is why it's so difficult to measure and control.

Are you allergic to perfume? See common symptoms and what ingredients to watch out for if you are allergic to perfume.

What was the impact of the Age of Enlightenment? Read about the impact and after-effects of the Enlightenment Age.

Iodine is a mineral known to be important for thyroid function. Learn about the many ways that iodine is important for your health.

HowStuffWorks looks at the many uses and potential dangers of sassafras.

Hamsters can be bitey little buggers. HowStuffWorks explains how to stop your adorable hamster from biting the hand that feeds it.

Ambrose Bierce dropped off the face of the earth in 1914. HowStuffWorks looks at the mysterious disappearance of literary heavyweight Ambrose Bierce.

No life, except possibly very small bacteria, would exist on Earth without photosynthesis.

HowStuffWorks finds out whether koalas drink water, the many uses for their butts and how Herbert Hoover became their best friend.

HowStuffWorks gets to know Helen Keller, who overcame deafblindness to live a life of service and inspiration.

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