Tom Standage is Digital Editor at The Economist and the editor of Technology Quarterly, our science and technology supplement. Mr Standage has his eyes on four in particular: 3-D printing; nanopore sequencing; wireless payments and augmented reality.br br On Tuesday, March 15th, Mr Standage will be answering your questions on Twitter. Join at: br Subscribe NOW to The Economist: br Get more The Economistbr Follow us: Like us: View photos: br The Economist videos give authoritative insight and opinion on international news, politics, business, finance, science, technology and the connections between them.