In 2006 David spent time with a community called Damanhur in the Italian Alps. It was to be the first of many visits. Damanhur, a 1000-strong community, have built the world's largest underground temple (the Eighth Wonder of the World), claim to have taught plants how to sing and have a 'fully-functioning time machine'. Another case of a deluded cult? David didn't think so, but then he wasn't convinced they could travel in time either.
After getting to know the community and even making a Radio 3 documentary about them, David thinks he's figured them out. The Damanhurians, he believes, have created something important and unique through their community, but it isn't time travel. To find out what it is, you'll have to see the talk.