PhysicsSticky yet slick material pulls water from foggy or humid air Fog catchers can provide water for drinking or farming in rain-starved regions. A new material traps water with sticky lubricant to gather bigger drops faster ¿ìè¶ÌÊÓÆµ
PhysicsA 'magic number' of people walking across a bridge makes it sway We thought walking in lock step made bridges sway, like London’s Millennium Bridge when it opened. But it turns out crowd size matters more than rhythm ¿ìè¶ÌÊÓÆµ