TechnologyLeaf-inspired material makes different liquids flow in opposite ways Inspired by a type of spiky evergreen leaf, researchers have come up with a material that forces different fluids to flow in opposite directions – even uphill News
HumansBritish legal deeds were once written on sheepskin to prevent fraud Over five centuries, the most common parchment for legal deeds in Great Britain was sheepskin – most likely because its fat content makes it obvious when text has been altered News