Researchers have moved closer to a long-sought goal in reproductive health: a safe, reversible, long-acting, and nonhormonal male contraceptive that could reliably stop sperm production. Credit: Shutterstock Cornell University scientists have taken a major step toward developing a safe, reversible, long-acting and 100% effective nonhormonal male contraceptive, considered the holy grail of male contraception. In a proof-of-principle study conducted in mice over six years, the team showed that