主播大秀

German stem-cell researchers have found adult mouse testicles to be source of adult stem cells that can be "reprogrammed" as embryonic stem cells. UN Convention on Biodiversity in Brazil sets environmental targets to slow the extinctions of plants and animals. Do children's brains grow differently depending on how clever they are? Scientists explore the lost world of Lake Vostok under the Antarctic ice and find fragments of an unexpected type of bacterial DNA.
NB: Brief un-edited stumble by presenter at 14:15.