Science
Two poles
Cutting a bar magnet does not isolate a north pole.
Cutting an ordinary bar magnet does not produce an isolated north pole and an isolated south pole. Each resulting magnetized piece has both kinds of pole.
Cutting a bar magnet does not isolate a north pole.
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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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