What is the impact of an extra year at school on the brain? Also, how poison dart frogs come by their toxins, using movies to track the developing infant nervous system, the insect-spread bacterial plant parasite that is a mastermind of matchmaking, and a new cancer tool to link disease with the best drugs. Chris Smith takes a look at some of the most powerful papers out this month in eLife... Get the references and the transcripts for this programme from the Naked Scientists website