Michigan State University scientists have pinpointed the molecular "switch" that supercharges sperm for their final sprint to an egg—a breakthrough that could reshape infertility treatments and pave the way for safe, nonhormonal male contraceptives. The work is published in the journal Proceedings of the National Academy of Sciences.

Scientists said Tuesday they have turned human skin cells into eggs and fertilized them with sperm in the lab for the first time—a breakthrough that is hoped to one day let infertile people have children.

Groundbreaking research has led to the birth of mice from two biological fathers, marking a major milestone in reproductive science and raising ethical and medical questions for future applications. Key Points at a Glance: Chinese scientists have successfully generated live mice using genetic material from two male parents. The mice survived to adulthood, demonstrating the feasibility of same-sex genetic reproduction in mammals.

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