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Radical new birth control for men: 100% effective for 10 years

Here’s how it works: a non-toxic, positively charged polymer gets injected into the little tube that your sperm pass through on their way from your testicles to, you know, out. The polymer doesn’t actually block the tube, but it stays there, and when sperm (which have a negative charge) pass by, the charge differential from the polymer zaps them. All of them. Every time.