Nanoflowers, each smaller than the thickness of a dollar bill, sprout up spontaneously on a surface dipped in salts and silicon. Courtesy of Wim Noorduin/Harvard University hide caption
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Carnegie Lake, Australia, 1999 Carnegie Lake in Western Australia fills with water only during periods of significant rainfall. In dry years, it is reduced to a muddy marsh. Flooded areas appear dark blue or black, vegetation appears in shades of dark and light green, and sands, soils and minerals appear in a variety of colors. NASA hide caption
Curiosity's self-portrait, captured on Oct. 31 and Nov. 1. NASA/JPL/Caltech hide caption
The United States Suomi NPP Satellite/NASA Earth Observatory hide caption
1909. Facing nearly due west from ridge northeast of Como Lake. Light selection cut in open ponderosa pine. Ground cover is comprised of perennial grasses and forbs, including basalmroot. A few low-growing bitterbrush plants can be seen in the vicinity of horses and in distance on left. A group of willows can be seen behind horsemen at left center. Photo 87357/U.S. Forest Service hide caption
An estimated 2 million hammerhead sharks are caught for the shark fin trade each year.
Shawn Heinrichs hide captionThe moon, seen from the International Space Station, on July 31. NASA hide caption
Onlookers crowd around their cars in the NASA causeway as they watch the US Space Shuttle Atlantis blast off into orbit from launch pad 39-B at Kennedy Space Center in the early morning hours of July 12 2001. Brian Cleary/AFP/Getty Images hide caption
Liftoff at 15 Seconds, 1982 Jack Perlmutter/Courtesy of Smithsonian hide caption
Sparklet Nasal "completely cures head colds" and is "invaluable for all ailments of the respiratory passages." All you have to do is stick something in your nose. (French, c. 1900-1905) G. Berni/Philadelphia Museum of Art hide caption
A scientist stands in front of an ice-rich permafrost exposure in the coastal zone of Herschel Island, Yukon Territory, Canada. Ice in the permafrost is melting, contributing to rapid erosion. Michael Fritz/Alfred Wegener Institute hide caption
Steve Jobs and Steve Wozniak formed Apple Computer Co. on April Fool's Day, 1976. The Apple I, introduced soon after, was the first computer to come with a fully assembled motherboard (central printed circuit board). It sold for $666.66. Science & Society Picture Library / Contributor/Life hide caption
The facilities at the Fukushima Dai-ichi nuclear power plant were designed to withstand strong earthquakes and tsunamis, but not to the strength and size experienced on March 11. Air Photo Service/AP hide caption
A Tokyo Electric Power Co. worker looks at gauges in the control room for Units 1 and 2 at the Fukushima Dai-ichi plant, Wednesday. AP Photo/Nuclear and Industrial Safety Agency hide caption
A fallout shelter sign graces the Madison County Courthouse in Huntsville, Ala., in 2007. The county is working on a plan to identify shelters that can house up to 300,000 people in the event of a nuclear incident. Dave Martin/AP hide caption