On March 29, 1929, President Herbert Hoover has a phone installed at his desk in the Oval Office of the White House. It took a while to get the line to Hoover’s desk working correctly and the president complained to aides when his son was unable to get through on the Oval Office phone from an outside line. Previously, Hoover had used a phone located in the foyer just outside the office. Telephones and a telephone switchboard had been in use at the White House since 1878, when President Rutherford B. Hayes had the first one installed, but no phone had ever been installed at the president’s desk until Hoover’s administration.
Keeling Curve, showing increase of carbon dioxide in Earth's atmosphere, is discovered
In March of 1958, Dr. Charles David Keeling begins regularly measuring the amount of carbon dioxide in the atmosphere from the Mauna Loa Observatory in Hawai'i. Over the ensuing years, his research will reveal what is now known as the Keeling Curve: a graph of continuously-taken ...read more