We sleep so that our brain can repair and refresh itself.
All 17 reporters have been detained for months.
Researchers say they have a lot more work to do.
Russia has shown an interest in targeting infrastructure.
Mars Desert Research Station in Utah
Vietnam’s activities in the South China Sea have touched China’s interests.
Heat waves appear across the tarmac at Sky Harbor International Airport.
When you remove a photo from your cell phone, it may not be gone for good.
Temperatures climb to near-record highs.
Columbia University graduation