VideoMaterial that changes colour as it stretches could be used in bandages An obsolete photographic technique that won a Nobel prize over a century ago has been resurrected to create a novel material that changes colour when stretched Video
HumansHow to make the best cup of cold-brew coffee Cold-brew coffee is on the rise. Enthusiasts say it has a smoother, less acidic taste and new research backs this up, finds Sam Wong, who takes his with ice and milk Regulars