Basic General Knowledge
The Olympic Flame symbolises

unity among various nations of the world
speed, perfection and strength
continuity between the ancient and modern games
sports as a means for securing harmony among nations

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Basic General Knowledge
On a night when the sky is clear, the temperature may dip considerably; on a cloudy night the temperature will usually dip much less. The reason for this difference is that

the clear sky allows radiant energy to escape readily from the earth
the clear sky allows the cold of outer space to reach the earth
on a cloudy night the clouds are warm and therefore retard the cooling
current of air carry the heat away from the earth on a clear night

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