Rachael has been with Live Science since 2010. She has a masters degree in journalism from New York University's Science, Health and Environmental Reporting Program. She also holds a Bachelor of Science in molecular biology and a Master of Science in biology from the University of California, San Diego.
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What is Testosterone?Testosterone is a male sex hormone that is important for sexual and reproductive development.
By Rachel Rettner Published
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Interactive Video Games More Likely to Cause Shoulder, Foot Injuries
The Nintendo Wii may get kids up on their feet, but they should watch where they swing that remote.
By Rachel Rettner Published

