Vitabu vinauwezo wa kubadili kabisa maisha ya mtu yeyote yule. Baada ya vita vya pili ya dunia wajapan walikuja na nadharia iitwayo KAIZEN (Continuous improve), yaani angalau kila siku uongeze kitu kipya kichwani chenye kukuza uelewa wako na kuboresha maisha yako kwa njia yeyote ile.
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