Ethel Maria Stewart (born 1879)

In 1879, in the year that Ethel Maria Stewart was born, on October 22nd, Thomas Edison tested the first practical electric light bulb. Lasting 13½ hours before burning out, it used a "a carbon filament or strip coiled and connected to platina contact wires". He applied for a patent on November 4th, receiving the patent in January 1880.

In 1897, in the January 22nd issue of "Engineering", the word "computer" was first used to refer to a mechanical calculation device. Previously - since the 17th century - the term computer meant "one who computes" and referred to human beings who worked with numbers.

In 1905, the German born physicist, Albert Einstein, proposed the Special Theory of Relativity: 1) that observers can never detect uniform motion except relative to other objects and that 2) unlike the velocity of massive objects, the speed of light is a constant and is the same for all observers independent of their constant velocity toward or away from the light source. Not such simple concepts that lead to the equation everyone now knows: E = mc2.

In 1943, on March 31st, the Broadway musical Oklahoma! opened. Written by Richard Rodgers and Oscar Hammerstein II (the first of their string of successful collaborations), audiences loved it. The musical ran for 2,212 performances originally and was made into a movie in 1954.

In 1968, on June 5th, Sen. Robert F. Kennedy was shot at the Ambassador Hotel in Los Angeles by Sirhan after celebrating his win in the California presidential primary. He died the next day at Good Samaritan Hospital.