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
Former White House Chief of Staff Rahm Emanuel speaks at his election night party on Feb. 22, 2011, in Chicago. As mayor of Chicago, Emanuel has faced major challenges, ranging from a ballooning deficit to education, the economy and crime.
Migrants arrive in Valletta, the Maltese capital, aboard a patrol boat on Oct. 12, a day after their boat sank, killing more than 30 people, mostly women and children — just the latest deadly migrant tragedy to hit the Mediterranean. Despite Europe's financial crisis illegal immigrants continue to attempt to enter Europe through its southern coastal countries as they seek a better life.
A physician collects medical equipment and medicines from the remains of the partially destroyed Rabaa al-Adawiya mosque compound hospital in Cairo on Aug. 15.
Khaled Desouki/AFP/Getty Images
Leonarda Dibrani, 15, holds her sister, Medina, in Mitrovica, Kosovo, on Friday. Police seized Leonarda from a school field trip last week and expelled her and her family from France. The case has prompted protests across France.
A growing number of children are entering puberty at younger ages — sometimes as young as 6 or 7. But in many schools, sex education classes don't begin before the fifth grade.
Researchers excavated the remains of five creatures who lived 1.8 million years ago, including this adult male skull. The excavation site, in Georgia in the former Soviet Union, was home to a remarkable cache of bones.
Courtesy of Georgian National Museum