UK's under-16 social media ban, and the first trillionaire

Coming up, the UK follows Australia's lead in introducing age-related restrictions on social media. But do they work? Plus, how biologists are fighting infection from inside cells; researchers trace the origins of cotton to Mexico; and Elon Musk becomes the world's first trillionaire. How might he spend his fortune? Like this podcast? Please help us by supporting the Naked Scientists (thenakedscientists.com/donate)