Neurologist Francis Jensen examining a teenage patient. Jensen decided to study the teenage brain when her own sons became teenagers. Now Jensen lectures to teens and parents about how teenagers' brains are different.
The northern lights dance over the Knik River near Palmer, Alaska. Activity on the surface of the sun creates this natural light show, but severe solar storms could devastate Earth's power and water utilities, and knock out communications.
A 60-mile-long iceberg known as B9B, right, crashes into the Mertz Glacier Tongue, left, in the Australian Antarctic Territory on Saturday. The collision created a new 48-mile-long iceberg.
AP Photo/Commonwealth of Australia