A participant at a NASA-sponsored Earth Day event puts together a puzzle of the Earth, Monday, April 22, 2013 at Union Station in Washington. (Photo Credit: NASA/Carla Cioffi)
Photographer NASA/Carla Cioffi
Date April 22, 2013
A participant at a NASA-sponsored Earth Day event puts together a puzzle of the Earth, Monday, April 22, 2013 at Union Station in Washington. (Photo Credit: NASA/Carla Cioffi)