Dr Chris Smith and the Naked Scientist team present the latest science news, analysis and breakthroughs. In today’s programme: Nearly 2000 tech experts and scientists are calling for a halt to AI research: we talk to one of them. And “simply inexcusable”: the words of the World Health Organisation as it condemns China’s failure to share key Covid data from the beginning of the pandemic. Plus we’re asking, “is there anybody out there?” - how likely it is we’re alone in this Universe?