Reuters: Tourists staring in wonder at the full force of the Zambezi River cascading over Victoria Falls struggle to believe the region is suffering one of its worst ever droughts, but local guide Patrick Sakala knows all is not well. Flows have dropped to 30-year lows at the waterfall straddling Zambia and Zimbabwe's shared border, as poor rains and soaring temperatures take their toll across southern Africa. "At this time of year you usually wouldn't be able to hear me over the thunderous roar," Sakala...