Defying Gravity – the Okavango Delta’s Mysterious, Miracle Waters
By David BristowBushtracks’ specialist guide and guest blogger David Bristow explains the geo-science behind the seemingly erratic water flow of Botswana’s Okavango Delta recently named the 1000th UNESCO World Heritage Site. Ever since the time Archimedes invented the water screw and the Romans built their aqueducts, people have known that open water can flow in only one direction […]