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Blu-U is a popular treatment of problematic skin. Learn more about how Blu-U works at HowStuffWorks.

Freckles are a common beauty skin problem. Learn more about how freckles work at HowStuffWorks.

Hemangiomas are a type of birthmark. Learn more about how hemangiomas work at HowStuffWorks.

Celiac disease is an autoimmune disorder -- more than just a food allergy to gluten. Read about celiac disease, symptoms and treatment.

A gluten-free diet means no wheat, barley or rye. Learn about gluten-free foods and how to eat a gluten-free diet.

Jellyfish venom is one of the deadliest toxins on Earth. Learn how humans and other animals trigger jellyfish venom and what the cure is.

Grandparents Day Crafts include making cups, vases, books, and soaps! Learn more about activities for kids to celebrate Grandparents Day.

Aging causes include both genetic and environmental factors. Find out what research says about aging causes and rates of aging.

Try these music activities for kids and explore the sonic landscape using household items! Learn about music activities for kids at HowStuffWorks.

These card games for kids provide hours of entertainment. Some games involve manual dexterity or fast thinking. Learn more about card games for kids.

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