I live in South Australia. It's pretty warm here, so

• >45C == unusually hot
• >40C == Warm summer day, but OK since EVERYONE has air conditioning
• >30C == cool summer day, regular late spring / autumn (aka fall) day
• >20C == cool day
• >10C == way cold, everyone is out in heavy jackets, beanies and gloves, start bitching about extreme weather
• 0C == unheard of crazy weather
• -10C == difficult to believe exists anywhere on earth

Though that 46 degree day we had last summer was a might unpleasant. Add 10 degrees to everything and you have the weather of Cober Pedy. Some parts of the earth really shouldn't be settled.

Actually, 1 cubic meter filled with water is 1000 liters of water. 10 centimeters cubed is 1 liter of water (i.e. 1000 cubic centimeters).

But you point about the elegance of Metric is apt.

You are close, but not quite. Hitler's basic failure was racism. Extreme racism. Sure, we all know that he massacred Jews, gays and many others, but racism ran to the hear of Hitler, and dictated his war plans too. Hitler didn't attempt to invade Britain because he respected the British race. You know that Hitler though the Jews were bottom of the barrel, but also thought pretty lowly of Russians and French. The British he rated as being only a little below Germans, and so saw them as a genuine threat. He though instead that invading Russia would be an easier option than GB because Russians in Hitler's eyes were a vastly inferior race. And his motivation for the war at large, not so much greed, but a grass-roots belief (of the sort usually only seen in religious fanatics) that the Aryan race are the true and rightful leaders of the earth.