When Setchell reviewed sperm counts over a 60-year period starting in the early 1930s, he found no change for either cattle or pigs and a slight, but significant, increase in sheep. Crucially, ...

When talking about fertility in routine practice, we usually refer to the World Health Organization’s guideline of roughly 15 million sperm per millilitre (and around 39–40 million total per ejaculate ...

A man browsing on a smartphone while lying in bed at night. The study, conducted by researchers from universities and health organizations in Switzerland, sounds very worrying at first glance: 2,886 ...