On this week’s show, we learn how the latest anti-doping tests hope to catch cheating cyclists, find out how scientists have made tiny brains from DNA and hear how chimps and children have a different take on sharing. Plus, the best of the rest from Nature.

On this week’s show, we learn how the latest anti-doping tests hope to catch cheating cyclists, find out how scientists have made tiny brains from DNA and hear how chimps and children have a different take on sharing. Plus, the best of the rest from Nature.