gender gap gender gap

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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A long line for a men's room at a 2009 tech conference in Omaha, Neb. Photos of this situation have now inspired a Twitter feed. SleepyJeanne/Flickr hide caption

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SleepyJeanne/Flickr