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How do sunless-tanning products work?
health.howstuffworks.com/skin-care/beauty/sun-care/question639.htm
How do sunless-tanning products work? Which is the most effective: self-tanning lotions or tanning pills?
What is sunburn?
health.howstuffworks.com/skin-care/beauty/sun-care/question637.htm
What is sunburn? Why does my skin turn red, and why is it so painful? Learn the basics of sunburns at HowStuffWorks.
What is a birthmark?
health.howstuffworks.com/skin-care/problems/baby/question628.htm
I noticed a light brown spot emerge on my newborn son's forehead when he was about three days old. It never went away. Everyone calls it a birthmark. What is a birthmark?
What is in an antiperspirant that stops sweat?
health.howstuffworks.com/skin-care/underarm-care/problems/question627.htm
What is in an antiperspirant that stops sweat?
St. John's Wort Overview
health.howstuffworks.com/wellness/natural-medicine/herbal-remedies/st-johns-wort.htm
St. John's wort and its effectiveness have been under consistent scrutiny. Many people have heard of the drug, but aren't sure what it is -- find out what's in it, what it's used for and what its side effects are.
How Human Reproduction Works
health.howstuffworks.com/pregnancy-and-parenting/pregnancy/conception/human-reproduction.htm
Reproduction is a basic drive in all animals, including humans. Think you know what human reproduction is all about? Discover the biology of sex.
How Menstruation Works
health.howstuffworks.com/wellness/women/general/menstruation.htm
Menstruation the female reproductive cycle that makes eggs available for fertilization. Learn about menstruation and menstrual cycles at HowStuffWorks.
How Muscles Work
health.howstuffworks.com/human-body/systems/musculoskeletal/muscle.htm
Muscles are your body's engine, and you couldn't do anything without them. Learn about skeletal muscle, smooth muscle, and cardiac muscle and how muscle contraction works.
How Hearing Works
health.howstuffworks.com/mental-health/human-nature/perception/hearing.htm
Hearing is made possible through physical movement, rather than chemical reactions. Learn about hearing and see diagrams explaining the hearing process.
When you have an itch, what is happening under your skin?
health.howstuffworks.com/skin-care/information/anatomy/question600.htm
When you have an itch, what is happening under your skin? And, why does scratching make it go away?