There are huge gaps in what we know about sperm, from how they navigate to why sperm counts are tumbling. The BBC unravels ...

After trying to conceive for 18 years, one couple is now pregnant with their first child thanks to the power of artificial ...

Temperature seemed like a primary factor, since mammalian evolution has developed numerous ways to help keep the male reproductive organs at or below the optimal 93.2 degrees Fahrenheit.

The executive order declares there are only "two sexes, male and female" and defines a "female" as "a person belonging, at conception, to the sex that produces the large reproductive cell." The ...

Male fertility rates have been plummeting over the past half-century. An analysis from 1992 noted a steady decrease in sperm counts and quality since the 1940s. A more recent study found that male ...

‌Sperm morphology refers to the form or shape of sperm, the male reproductive cell. Sperm of various plant and animal species differ from one another, sometimes in surprising ways. The sperm of ...

Claims spread that definitions of "male" and "female" included in a January 2025 executive order that asserted sex is established at conception accidentally classified all Americans as women.

The single-cell zygote possesses genetic coding related to sex — typically XX (female) or XY (male) — but it cannot produce its own reproductive cells. Sign up for PolitiFact texts ...

The Columbia University Fertility Center used AI to find viable sperm in an infertile man, offering new hope of biological ...

It’s not just about chromosomes. Or reproductive cells. Or any other binary metric. Many genetic, environmental and developmental variations can produce what are thought of as masculine and ...

Because male reproductive health is in decline – and the numbers are too stark to ignore. ... In some cases, the chance of finding even a single usable sperm cell is as low as 40 per cent.

The executive order declares there are only "two sexes, male and female" and defines a "female" as "a person belonging, at conception, to the sex that produces the large reproductive cell." The ...