A month ago, 'Google Nose' was an April Fool's prank: Sniff your laptop for eau de wet-dog or scent of Egyptian tomb. But it turns out real engineers have been working on smell tech. John Laurenson reports from a film festival in the Austrian city of Linz, where a smelly movie has just premiered. And, when Yahoo's CEO Marissa Mayer curbed the ability of employees to work from home, she got rapped by those who saw this as old-thinking. Now, the company is trying to make Yahoo a more attractive place to work by, among other things extending maternity and paternity leave.