What sperm can tell you about your partner's health

This week we're joined by Tristan Taylor, the founder of Mandrology, who is biohacking his way to sperm health. He explains why sperm quality is a biomarker of health, in the same way that heart rate and blood pressure is -- and what you can do to improve it. Meanwhile, Emma Whitney, director of embryology and genetics at The Evewell, explains why not all add-ons are made equal -- and why…