This week, the latest innovations in solar power technology including a Cambridge team racing from Darwin to Adelaide in a solar car, community co-operatives empowered by solar panels, and how algae harvest the Sun's energy. In the news, how wobbles in the Earth's core are affecting time, how nerves control prostate cancer growth and the turmeric-thalidomide combo being used to combat cancer. Plus, can you produce power from poo? Like this podcast? Please help us by supporting the Naked Scientists)