Jabs for five to 11-year-olds, lockdown effectiveness, and being green on two wheels. Governments across the UK have decided to offer Covid vaccinations to primary school-aged children. What was the data behind this decision? What effect did lockdowns have on preventing deaths from Covid? We look at a research paper that says almost none. Plus, is Elon Musk right to warn of a global population collapse? And can it really be greener to ride an e-bike than a good old-fashioned push bike?