Sperm counts may be decreasing globally, potentially contributing to infertility.

“these days we hear a lot about the diminishing quality of sperm which in some way seems to be tacked to the conversation about diminishing quality of environment people intelligence you know there's a lot woven into this statement that sperm quality is declining and some of it I think people assume is related to environmental changes some of it I think people assume it are related to changes in Behavior so maybe less exercise less sunlight who knows hopefully you'll tell us what's really going on but the first question I have is is sperm quality actually declining”