Four in five Americans check their phones within 15 minutes of waking, and 79% keep that device on or near them for 22 hours each day. As author and entrepreneur Nir Eyal points out, these devices have the human race hooked - but why? We sat down with him to find out more.

Atlas of the Habitual is a GPS-enabled self portrait. Inspired by a move following a breakup with a girlfriend, between 24 August 2010 and 13 March 2011, Tim Clark recorded every single movement he made around Bennington, Vermont.

Brushing teeth, nail-biting, and a biscuit with your cuppa; 40% of our day is occupied by habitual behaviour. There has been a rise in the number of productivity apps tech helping people form better habits. Can electric-shock wristband Pavlok jolt you into action?

“Diamonds are a girl’s best friend” is a mantra that many women lived by throughout the 20th century. But times have changed. For Millennials in particular, fine jewellery – just like cars, houses and health insurance before it – has become an unappealing investment.