Scientists Found Sperm’s Power Switch—And a Way to Turn It Off by Megan Molteni from on 2017-05-15 20:03 (#2PJSR) Sperm need calcium ions to drill into an egg and fertilize it. Compounds that muck up ion transport could create a new class of male birth control. The post Scientists Found Sperm's Power Switch-And a Way to Turn It Off appeared first on WIRED.