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

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

The nucleus of a male gamete and the nucleus of a female gamete join (fuse), and a single new cell is formed. This is called fertilisation. There are two types of fertilisation.

‌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 ...

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.

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 ...

Even so, when it comes to the male reproductive system, some effects of cannabis are becoming clear. By looking at 48 studies from around the world, Dr. Pastuszak found in 2019 that cannabis ...

Knowing that Toxoplasma can reside in male reproductive organs has prompted analyses of fertility in infected men. A small 2021 study in Prague of 163 men infected with Toxoplasma found that over ...

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 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 ...