Description: A 1936 exchange of letters about the prickly porcupine preserves both a contemporary scientific debate and the wit and wisdom of a young Utah girl with a beloved pet.
Description: Henry David Hubbard (1870-1943), a physicist at the U.S. National Bureau of Standards, designed the first edition of the "Periodic Chart of the Atoms" in 1924. The chart is still in use today, continually updated to reflect new elements.
Description: To celebrate Women’s History Month, here are two examples of 20th-century women who applied their education and expertise in geology and paleontology outside traditional university career paths.
Description: On January 24, 1925, for the first time in over a century, a total solar eclipse would be visible across the northern part of the United States. How scientists used a dirigible to observe the phenomenon.
Description: In 1925, seven George Washington University students volunteered to stay awake for sixty hours, and drove, danced, sang, and swam in an effort to remain alert.
Description: On July 20, 1969, television broadcasters and Smithsonian visitors joined in watching history in the making when astronauts stepped onto the Moon.
Description: In the U.S. Department of Agriculture (USDA) Office of Exhibits, Margaret Jane Russell Roller (1888-1973) had begun to specialize in fabricating lifelike wax models of food and animals.