Multirotor drones may get all the glory, but fully rotating "monocopters" are much more energy-efficient. A new one distinguishes itself further, as it can squeeze through narrow spaces or drop like a falcon by reducing its wingspan while in flight.
Fish swimming in schools create surprising stealth underwater, mimicking just one fish's noise. Research by Johns Hopkins offers insights for quieter submarines.
Schools of Fish Can Make Less Noise than Solitary Swimmer, Study Shows sci.news - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from sci.news Daily Mail and Mail on Sunday newspapers.
What s quieter than a fish? A school of them scienceblog.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from scienceblog.com Daily Mail and Mail on Sunday newspapers.