A reversible male contraceptive, targeted to the testes with
magnets

Women have several choices for long-lasting,
reversible contraceptives, but most options for men are either
single-use, such as condoms, or difficult to reverse, like
vasectomies. Now, in a step toward a safe, long-lasting and
reversible male contraceptive, researchers reporting in ACS’ Nano
Letters have developed magnetic, biodegradable nanomaterials that
reduced the likelihood of mice fathering pups for at least 30
days.