Heavy rain events, which happen just a few days each year, have an outsize role in sending nitrogen runoff into waterways, computer modeling indicates.

Older male monkeys sire fewer offspring, a new study shows. The finding could have implications for human infertility, researchers report.

"It's important that women who elect to have a C-section know that there is a chance they may have difficulty conceiving in the future."

Mapping the mechanism that lets legumes make their own ammonium fertilizer could help make agriculture more sustainable.

Insurance coverage for infertility treatments reduces maternal mortality by 20% among white women, research finds.

Society shapes people’s preferences and emphasises the value of having genetically related children.

One enzyme may determine whether human development starts correctly. The discovery could help explain why some fertilization fails.

The genome of the hornwort, one of the first plants to colonize land, may offer a way to grow crops more efficiently with less synthetic fertilizer.

Polycystic ovary syndrome (PCOS) "...affects women in a number of ways throughout their life course. It is not just about ovaries."

Certain fish are super-urinators, meaning that they contribute more nitrogen to the ecosystem. Unfortunately, they're also prize catches.