Podcast: Ending AIDS in South Africa, what makes plants gamble, and genes that turn on after death

Listen to stories on how plants know when to take risks, confirmation that the ozone layer is on the mend, and genes that come alive after death, with Online News Editor David Grimm.   Science news writer Jon Cohen talks with Julia Rosen about South Africa’s bid to end AIDS.   [Image: J.Seita/Flickr/Music: Jeffrey Cook] Learn more about your ad choices. Visit megaphone.fm/adchoices