Ceremony of the Keys (London) after the Tower. The event is usually sold out at least 12 months in advance. Ceremony of the Keys (London) The Ceremony of the Keys is an ancient ritual, held every evening at the Tower of London, when the main gates are locked for the night. It is said to be the oldest military ceremony in the world, and is the best-known ceremonial tradition of the Tower. At exactly 9.53 pm, the Chief Yeoman Warder, dressed in Tudor watchcoat and bonnet, and carrying a candle lantern, leaves the Byward Tower and falls in with the Escort to the Keys, a
Ancel Keys famous seven countries study, which led to the currently held medical opinion regarding the dangers of cholesterol, fat and substances containing the same has been criticized as ignoring the cases of Denmark and Norway (countries where the diet is rich in fat, but occurrence of heart disease is low) and Chile (where diet is low in fat, yet occurrence of heart disease is high). Keys was an atheist. When Keys was hired at the Mayo Foundation in 1936, he hired Margaret Haney (1909–2006) as a medical technologist. In 1939 they married and had three children: Carrie D'Andrea, Henry Keys, and