Students listen intently while an exhibitor conducts an experiment at NASA's Earth Day event. The event took place at Union Station in Washington, DC on April 22, 2014. Photo Credit: (NASA/Aubrey Gemignani)
NASA's Administrator, Charles Bolden watches as some students conduct an experiment with a balloon at NASA's Earth Day event. The event took place at Union Station in Washington, DC on April 22, 2014. Photo Cre More
An attendee of NASA's Earth Day event observes the glow from a bracelet that is part of an exhibit at the event. The Earth Day event took place at Union Station in Washington, DC on April 22, 2014. Photo Credit More
NASA Administrator Charles Bolden speaks to students who attended the NASA sponsored Earth Day event April 22, 2014 at Union Station in Washington, DC. NASA sponsored the Earth Day event as part of its "Earth R More
NASA Astronaut John Mace Grunsfeld takes a quick selfie with astronauts at the International Space Station at the NASA sponsored Earth Day event April 22, 2014 at Union Station in Washington, DC. NASA announced More
Students listen intently while Astronaut John Mace Grunsfeld speaks at NASA's Earth Day event. The event took place at Union Station in Washington, DC on April 22, 2014. Photo Credit: (NASA/Aubrey Gemignani)
An attendee of NASA's Earth Day event conducts an experiment with circuits. The event took place at Union Station in Washington, DC on April 22, 2014. Photo Credit: (NASA/Aubrey Gemignani)
Students listen intently while NASA's Director, Earth Science Division, Mike Freilich, speaks at NASA's Earth Day event. The event took place at Union Station in Washington, DC on April 22, 2014. Photo Credit: More
NASA Administrator Charles Bolden poses for a quick selfie with students who attended the NASA sponsored Earth Day event April 22, 2014 at Union Station in Washington, DC. NASA announced the "Global Selfie" eve More
NASA's Administrator, Charles Bolden, visits the exhibits at NASA's Earth Day event. The event took place at Union Station in Washington, DC on April 22, 2014. Photo Credit: (NASA/Aubrey Gemignani)
Students listen intently to a speaker while at NASA's Earth Day event. The event took place at Union Station in Washington, DC on April 22, 2014. Photo Credit: (NASA/Aubrey Gemignani)
NASA's Administrator, Charles Bolden, conducts an experiment using circuits at NASA's Earth Day event. The event took place at Union Station in Washington, DC on April 22, 2014. Photo Credit: (NASA/Aubrey Gemignani)