NASA's Opportunity rover captured an image of a distant dust devil on Mars, the first one it has seen in its 12-year stay.
NASA caught on camera the X 2.7 flare that caused a radio blackout on May 5.
A study says that new Environmental Protection Agency regulations will save at least 3,000 lives a year.
Wind, solar, biomass and geothermal energy have helped to power Costa Rica's energy requirements for this year so far.
