When a middle-aged South African engineer recently set out to write a novel in his native Zulu, he found himself hamstrung by a lack of words to describe modern life. Determined not to use English as a crutch, Phiwayinkosi Mbuyazi instead created 450 new words in Zulu, the mother tongue of a quarter of South Africa's 50 million population. His book, titled "Amayiphendleya," is an adventure tale about four teenage boys and the wonders of technology.