Producer David Schulman has been on a quest – he’s been trying to find a single tree. David’s a violinist.  And for him, violins aren’t just boxes made of wood – they’re magical objects. With voices and spirits that can seem almost human.  Old violins even work as a sort of ‘time machine’ – by the sound they make and by their stories, they carry us back into the past.And it turns out there’s solid science behind this method of time travel.