Gwyneth loves them, Adele can’t sing without them and Kim Kardashian uses them to deal with stress. Many of us are lured by their beauty and promise of mystical powers, but are ‘healing’ crystals connecting us to the earth – or harming it? Eva Wiseman reports
The long read: For a century, the humble paper towel has dominated public toilets. But a new generation of hand dryers has sparked a war for loo supremacy