In the harsh heat of Cairo International Airport last year, a Chinese-American traveler idly watched a scrawny Egyptian newsboy. The boy got nowhere with his tabloid sheet. But when Richard C. Kao of Los Angeles saw the boy snatch a piece of bread from a restaurant table, Kao decided that he wanted a newspaper. He offered a £5 note, his smallest bill. The boy quickly fetched the change. Counting it, Kao discovered that he had got his paper free. It was simple enough, the boy explained. The slender man "with the kind face" had only a £5 note; he must be...
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