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Samuel Pierpont Langley conducted the first successful flight of an unpiloted, engine-driven, heavier-than-air craft from a houseboat near Chopawamsic Island in the Potomac River.
Published Aug 19, 2025
Chlorophyll is used by algae and other phytoplankton--the grass of the sea--to convert sunlight and carbon dioxide into sugars. These maps show chlorophyll concentrations in the ocean, revealing where phytoplankton are thriving.
Jul 2002 — Jul 2025
Well-wishers in Hawaii welcomed the astronauts on July 26, 1969, after they landed on the Moon, splashed down in the Pacific, and traveled by aircraft carrier to Pearl Harbor.
Published Jul 24, 2025
Greenness is an important indicator of health for forests, grasslands, and farms. The greenness of a landscape, or vegetation index, depends on the number and type of plants, how leafy they are, and how healthy they are.
Feb 2000 — May 2025
The Rwenzori Mountains in eastern Africa are renowned for their water resources and endemic plants and animals, but like elsewhere in the tropics, the glaciers are dwindling.
Published May 17, 2025
