Some biohackers claim that icing your testicles daily can increase testosterone, sperm count, and libido. We were a bit skeptical, so we asked Martin S. Gross, MD, FACS, a urologist and men’s health ...

Bryan Johnson has tracked his erections, injected his son’s plasma, monitored his girlfriend’s vaginal microbiome, and eaten the same 2,000-calorie meal every day for years. His latest experiment ...