Analysis of living vertebrates shows that changes in brain evolution helped drive major shifts in reproduction across dinosaurs and birds. A bird egg can look surprisingly oversized for the body that produced it. That puzzle becomes even stranger when viewed through deep time: the largest known bird eggs exceed the largest eggs found from nonavian [...]

New research suggests aging ovaries may help shape inflammation across the body.

Stored sperm may age faster than reproductive medicine has assumed, suggesting that shorter abstinence periods could benefit fertility outcomes. For decades, men undergoing fertility testing or treatment have often been advised to abstain from ejaculation for several days beforehand, based on the assumption that longer storage allows sperm counts to build up. But a major [...]

Researchers have identified a gene that appears to balance a powerful evolutionary trade-off, boosting growth and reproductive success early in life while carrying hidden costs later on. The biological processes that help build a healthy young body may also sow the seeds of aging and cancer. Researchers have now identified a gene that appears to [...]