Bill Gates' speech in 2015 at TED, about what he considered the greatest threat to humanity: viruses. In 2014, the world has avoided a frightening global outbreak of Ebola, thanks to thousands of selfless health workers – and with a lot of luck. In retrospect, we know what we should have done better. So, now Bill Gates is proposing to implement all our good ideas, from script design to vaccine research and training of healthcare workers. As it says, 'There is no reason to panic... but we must move forward'.