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-40°
Celsius and Fahrenheit give the same number at minus forty.
Minus forty degrees Celsius is the same temperature as minus forty degrees Fahrenheit. It is the single temperature at which these two scales display the same numerical value.
Celsius and Fahrenheit give the same number at minus forty.
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0.01°C
Water can boil and freeze at the same time.
Water can coexist as ice, liquid and vapor near its triple point, about 0.01 °C and 611 pascals. In a vacuum demonstration, evaporative cooling can make liquid water freeze while it is still boiling.
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Low contrast
The Great Wall is difficult to distinguish from orbit with the naked eye.
The Great Wall is generally not discernible with the unaided eye from low Earth orbit, and it is not visible from the Moon. Saying it can never be seen from any altitude called space is too absolute: viewing conditions, equipment and identification all matter.
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