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Shortest US capital tenure?

[ad_1] Washington, DC became the US capital in the 1800s, after eight other cities. Philadelphia was the first capital, with Lancaster serving for one day. Other cities, including York and Princeton, also served as capital at different times. The United States declared independence in 1776, but Washington, DC did not officially become the nation’s capital […]

Shortest time interval measured?

[ad_1] Scientists led by Professor Ferenc Krausz have measured the shortest time interval ever recorded, at 100 attoseconds, using tomographic images to record the state of an electron 100 attoseconds after it left the nucleus of an atom. The measurement was achieved using pulses of extreme ultraviolet laser light. The shortest time interval ever measured […]