PHILADELPHIA (CBS) — While searching the internet for stories that get you talking, we came across this report about some of the weirdest scientific studies. According to the report on Chacha.com, if size matters, male private parts are apparently shrinking.

According to the report, the study’s leaders claim to have bona fide research that says the average size of a penis is roughly 10 percent smaller than it was 50 years ago.

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The post on the study doesn’t say how the research was conducted or give numbers. But it does provide several reasons for the supposed  shrinkage, including weight gain, stress, smoking and alcohol.

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The report also says air pollution has been shown to “negatively impact penis size.”

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For more information, visit: www.chacha.com.