Basic General Knowledge
The five intertwined rings or circles on the Olympic Flag made of white silk are

from right to left blue, black, green, red and yellow respectively
from right to left blue, yellow, black, green and red respectively
from left to right yellow, red, green, black and blue respectively
from left to right blue, yellow, black, green and red respectively

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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
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
the clear sky allows the cold of outer space to reach the earth

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