_ On Dec. 10, 1768, the first part of the first edition of the Encyclopedia Britannica, the oldest continuously published and revised work in the English language, was published and advertised for sale in Edinburgh, Scotland._ On Dec. 8, 1854, Pope Pius IX proclaimed the doctrine of the Immaculate Conception, in which he asserted that Mary, the mother of Jesus, was from the moment of her conception free from the effects of “original sin.”_ On Dec. 9, 1868, the world’s first traffic light was erected near Westminster Bridge in London. It didn’t have much of a chance to prove its ...