We may be just years away from the longest-lasting and most hassle-free contraceptive ever invented. MicroCHIPS Inc. is building a wireless device that is only 20 millimeters long and that would last 16 years. The chip, which would lie under the skin in the buttocks, upper arm or abdomen, slowly releases levonorgestrel, a hormone used in some types of the Pill, in some types of hormonal IUDs and in Plan B.

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