A Brief History of Time

Jan 1: Fire, Stone

Nov 19: Funerals

Nov 26: Homo Sapiens

Dec 6: Baked Clay, String

Dec 23: Sun-Dried Bricks

Dec 25: Domestic Grain and Livestock

Dec 26: Walled Towns

Dec 27: Copper, Lime

Dec 28: Bronze, Beer, Wheels

Dec 29: Iron, Glass

Dec 30: Paper

Dec 31: Caustic Soda