Reuters: It is the top of the hour at ten oclock in the morning and, broadcasting from the top of Esibila hill in Western Kenya, Moses Ombogo is telling farmers to prepare for early rains. My dear listener, mother, father, grandma, grandpa, uncle and aunt, we are happy to inform you that the rains have now come and you should be preparing to start planting, he says. Down the slope, 80-year-old Mariam Omulama is holding a blue radio with a long aerial. The radio has a winding handle to power it, and a...