Description: When tragedy struck during the space shuttle era, mourners found a place to honor the fallen astronauts of the tragic Challenger and Columbia flights at Smithsonian’s National Air and Space Museum.
Description: [caption id="" align="aligncenter" width="425" caption="Dr. Judith A. Blake, biological technician at the Smithsonian's new Molecular Systematics Laboratory operated by the National Museum of Natural History at the Smithsonian's Museum Support Center in Suitland, MD, stores tissue samples from plants and animals at temperatures of -148 degrees Fahrenheit, 1990, by Harold E.