The human Y chromosome (left) holds the code for "maleness"; that's the X on the right. Andrew Syred/Science Source hide caption

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Andrew Syred/Science Source

With Men's Y Chromosome, Size Really May Not Matter

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Testosterone levels in men can go up and down throughout the day. Katherine Streeter for NPR hide caption

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Katherine Streeter for NPR

Test First Before Going For Those Testosterone Supplements

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Katherine Streeter for NPR Katherine Streeter for NPR hide caption

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Katherine Streeter for NPR

Testosterone, The Biggest Men's Health Craze Since Viagra, May Be Risky

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Some men take testosterone hoping to boost energy and libido, or to build strength. But at what risk? iStockphoto hide caption

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iStockphoto

There's more than one reason to aim for a good night's sleep. Charles Taylor/iStockphoto.com hide caption

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Charles Taylor/iStockphoto.com

The active ingredient in Propecia, a baldness remedy approved by the Food and Drug Administration in 1997, is showing new promise as a way to prevent some prostate cancers. AP hide caption

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AP

Evidence Supports Pill To Prevent Some Prostate Cancers

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Skipping breakfast is risky. iphoto hide caption

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iphoto

Why Skipping Breakfast Might Raise Risk Of Heart Disease

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A billboard advertising robotic surgery hangs outside Boston's Fenway Park in 2009. Hospitals and doctors have heavily promoted robotic surgery. Charles Krupa/AP hide caption

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Charles Krupa/AP

Prescriptions for testosterone medications, such as Testim and AndroGel, to men 40 and older rose threefold over the decade ending in 2011 MICHAEL BRYANT/MCT/Landov hide caption

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MICHAEL BRYANT/MCT/Landov

A man smokes a cigarette as he takes a break at a fruit market in Hyderabad, India. Smoking tobacco is eight times more prevalent among Indian men than women. Noah Seelam/AFP/Getty Images hide caption

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Noah Seelam/AFP/Getty Images