Meet the COVID-19 patients who are still suffering the after-effects of the disease, months after catching the virus. They weren't ill enough to be hospitalised, and thought they'd recover after a fortnight. Now, though, they're on a rollercoaster of bizarre symptoms. They're calling it 'long COVID' - but what is it? Plus, in the news: children seem to harbour more coronavirus than adults; a new space mission to Mars gets under way, and the science of cows licking each other... Like this podcast? Please help us by supporting the Naked Scientists