As humankind moves toward the goal of establishing a long-term presence on the moon and Mars, the question of whether ...

Sperm may lose their ability to navigate in microgravity, raising new questions about whether human reproduction is possible ...

The United States’ announcement of building a residential base on the Moon within 10 years has drawn attention, amid research suggesting that human settlement in space across generations may be ...

When sperm meets egg, the start of life is not quiet. Under a special microscope, researchers have watched a tiny light show at fertilization. They see a microscopic flash at fertilization, a burst of ...

Human bodies have to be built from a single egg cell that's fertilized by a sperm cell. Many rounds of cell division occur as the body is developing, and it seems that there are plenty of chances for ...

Life’s most important rendezvous occurs between a sperm and an egg, and scientists have long debated precisely how this get-together occurs. In particular, with the precise knowledge of a human ovum’s ...