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Why is September 22 important to the Britons and dentists? Back in 1955, that was the date when British commercial television started broadcasting. The first paid advertisement it transmitted was a toothpaste commercial (ironically enough, the British are not famous…

A couple of years ago, the Ngewana family sat around the kitchen table of their Cape Town home and set themselves a target: over the next six months, they would try to cut their electricity use by 40% by retrofitting…