Saladin (1137/1138–1193) was a Muslim military and political leader who as sultan (or leader) led Islamic forces during the Crusades
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The Gregorian Calendar is the most widely used calendar in the world today. It is the calendar used in the international standard for Representation of dates and times: ISO 8601:2004.
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Oil overtook coal to become the world's largest energy source in 1964. Oil resources are not as extensively distributed worldwide as coal, but oil has crucial advantages. Fuels produced from oil are nearly ideal for transportation. They are energy-dense, averaging twice the energy content of coal, by weight.