Sex cells: egg and sperm

What the scientists are saying… Human sex ...

(even if they don’t want to be a dad)

A company is offering parents having IVF the chance to check embryos for a range of traits and conditions, but some experts fear that choices may go beyond preventing disease

No nonsense trends, no impossible goals, just simple, straightforward advice for good health-keeping. This month… From stress-related cortisol to ‘orgasmic’ oxytocin, Polly Vernon shares all she’s learned about hormonal health

DOCTORS AT COLUMBIA UNIVERSITY FERTILITY CENTER have reported the first pregnancy using a new AI system, in a couple who had tried to conceive for nearly two decades. The pregnancy was possible becaus

We think of evolution as a slow, gradual process, but that’s not always the case. Some species undergo a rapid transformation