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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?

Are all blood types needed for for donation?

health.howstuffworks.com/human-body/systems/circulatory/question593.htm

I would like to donate blood and keep hearing about which blood types are needed most. How do human blood types work?

How Prenatal Testing Works

health.howstuffworks.com/pregnancy-and-parenting/pregnancy/issues/prenatal-testing.htm

During a pregnancy, different kinds of prenatal testing are an important part of the process. See how prenatal testing protects both the mother and child.

What makes your arms, legs and feet fall asleep?

health.howstuffworks.com/human-body/parts/question552.htm

What makes your arms, legs and feet fall asleep? Basically, your nerves go a little haywire when your limbs fall asleep. Learn why.

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