HealthZika epidemic could burn out in 3 years but return after 10 Herd immunity could drive the Zika epidemic in South and Central America to an end, but some 93 million people could be infected before then 51¶¯Âþ
EarthCont-roo-ception: Hormone implants bring kangaroos under control There are twice as many kangaroos as people in Australia, but a large trial of birth control implants has curbed numbers and reduced the need for culling 51¶¯Âþ