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Mental illness is a term used in the study and practice of psychology. Visit HowStuffWorks to learn all about the term mental illness.

The Doll's Theater of Carlsbad Caverns looks otherworldly and took ages to form. What other incredible sights await us below ground?

Numbrix is a puzzle game in which a player solves a matrix of numbers using logic. Learn how to play Numbrix at HowStuffWorks.

Is there life after death? Most of us have pondered this question. See research and studies on life after death at HowStuffWorks.

Join us as we dive into the deep blue to meet one of the ocean's most fascinating and mysterious creatures: the yellow-bellied sea snake.

Investment diversification helps protect your assets in the long-term. Read about diversification and how to use it when allocating your investments.

MSM can be used to treat many ailments and illnesses. Learn all about MSM and other alternative medicines at HowStuffWorks.

The 1951 Harley-Davidson Police Special motorcycle was used by law enforcement agencies. See pictures and learn about this Harley-Davidson bike.

What's the difference between nail stickers vs. polish strips? Find out which to use, nail stickers vs. polish strips

The Birdhouse Treasure quilt block features the image of a birdhouse. Use it in your next garden quilt design with the free quilt block here.

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