If Earth overheats, can it be artificially cooled? Should the effort begin now? Who would decide? The very idea of "geoengineering," and the unknown risks of tweaking our climate, leaves many scientists with more questions than answers.
AP Photo/Courtesy of NASA
Most people associate the Nile with Egypt, but the river also flows through South Sudan, where much of it is bordered by jungle. That makes it a excellent destination for rafting and wildlife enthusiasts, says travel guide author Max Lovell-Hoare.
Courtesy of Levison Wood/Secret Compass