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For Scientific American Science Quickly, I'm Rachel Feltman. The World Health Organization estimates that infertility impacts one in six adults globally.

But when it comes to addressing infertility, male partners are often left out of the equation.

Some studies suggest that in 18 to 27 percent of cases where a heterosexual couple seeks

medical help for fertility issues, doctors won't bother

to run any tests on the man. Those stats might make you think male fertility issues are rare,

but that's definitely not the case. According to some estimates, male fertility issues are the

sole cause of infertility in some 20% of cases and contribute to the problem in another 30 to 40%

of cases. In other words, if a couple is having trouble conceiving, there's about a 50-50 chance

that sperm-related issues are a factor. Perhaps because of the stigma around talking about and testing

for male infertility, there hasn't been much innovation in those

diagnostics. That's starting to change, with at-home testing options popping up to offer

privacy and convenience. But today's guest is pushing the envelope even further. He's the co-author

of a recent study that suggests folks could test some aspects of sperm health right at home

without even sending their samples off to a lab. Shashanta Mitra is a professor of mechanical

and mechatronics engineering at the University of Waterloo in Canada. Thank you so much for

...