简介:Afleaandaflyflewupinaflue.Saidtheflea,“Letusfly!”Saidthefly,“Letusflee!”Sotheyflewthroughaflawintheflue.一只跳蚤和一只苍蝇在排烟管里往上飞。跳蚤说,“我们飞!”苍蝇说,“我们逃!”它们就从排烟管的裂缝飞出去了。
简介:Biomaterialssuchasbone,teeth,nacreandsilkareknowntohavesuperiormechanicalpropertiesduetotheirspecificnanocompositestructures.Herewereportthatthewoodpecker’stongueexhibitsanovelstrengthandflexibilityduetoitsspecialcompositemicro/nanostructure.Thetongueconsistsofaflexiblecartilage-and-boneskeletoncoveredwithathinlayertissueofhighstrengthandelasticity.Attheinterfacebetweenthecartilage-and-boneskeletonandthetissuelayer,thereisahierarchicalfiber-typedconnection.Itisthisspecialdesignofthetonguethatmakesthewoodpeckersefficientincatchingtheinsectsinsidetrees.Thespecialmicro/nanostructuresofthewoodpecker’stongueshowusapotentialmethodtoenhancetheinterfacialconnectionbetweensoftandhardmateriallayersforbio-inspiredcompositesystemdesigns.