EQUAL SHOT Every year, slightly more boys than girls are born. But when egg meets sperm, roughly equal numbers of male and female embryos are conceived, a new study finds.
Hannamariah/Shutterstock
EQUAL SHOT Every year, slightly more boys than girls are born. But when egg meets sperm, roughly equal numbers of male and female embryos are conceived, a new study finds.
Hannamariah/Shutterstock