In the 1990s, Bluetooth was invented in a lab in Lund, Sweden. The technology is used today to wirelessly connect accessories such as mice, keyboards, speakers and headphones to desktops, laptops and mobile phones. It’s named after Harald Bluetooth, a Viking king who was said to have blue teeth.Sven Mattison one of the brains behind the technology tells Gill Kearsley how the name Bluetooth came about following some drinks after a conference.(Photo: A mobile phone with the Bluetooth logo. Credit: Westend61 via Getty images)