Spring (hydrology) (current) Kidnapped robot problem Propositional logic Distance between two parallel lines Gelman Library Martin Fowler (software engineer) BitTorrent (protocol) Pinyin input method FutureBASIC Bandwidth (signal processing) Fold (higher-order function) No. 1 Wing AAC SWLABR Open letter on artificial intelligence (2015) Gadget (machine instruction sequence) Net zero LinuxTag Plancherel theorem