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.
Pakistanis walk on an island that emerged off the coastline of the Arabian Sea following a deadly magnitude 7.7 earthquake in Pakistan's southern province of Baluchistan on Sept. 24.
Gwadar local government office/AP
Party On: Legislation passed last week allows the Federal Helium Reserve to continue selling the stockpiled gas. Above, Jonathan Trappe launches his 370-balloon craft from Caribou, Maine, in an attempt to cross the Atlantic Ocean on Sept. 12.
Alexandre Ayre/Barcroft Media/Landov
Workers assemble solar panels at the now-bankrupt Suntech in the eastern Chinese city of Wuxi. Overproduction in the country has helped lower the cost of solar panels.
Peter Parks /AFP/Getty Images