HealthHuman eggs release chemicals that attract some sperm more than others A person’s eggs release chemicals after sex that preferentially attract sperm from certain people, which might help explain why some people have fertility problems News
HumansChina’s two-child policy linked to 5 million extra babies in 18 months A Chinese government policy allowing all couples to have two children led to an additional 5.4 million births in the first 18 months after it took effect News