Biohackers Are Convinced Icing Their Balls Will Supercharge Their Sperm

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 involves ice packs on his testicles, and now half a million people on Reddit are following suit. Johnson, the billionaire biohacker behind Project Blueprint, claims that 27…