Rainbow_set4_001_noisy	When the sunlight strikes raindrops in the air, they act as a prism and form a rainbow.
Rainbow_set4_002_noisy	The rainbow is a division of white light into many beautiful colors.
Rainbow_set4_003_noisy	These take the shape of a long round arch, with its path high above, and its two ends apparently beyond the horizon.
Rainbow_set4_004_noisy	There is, according to legend, a boiling pot of gold at one end.
Rainbow_set4_005_noisy	People look, but no one ever finds it.
Rainbow_set4_006_noisy	When a man looks for something beyond his reach, his friends say he is looking for the pot of gold at the end of the rainbow.
Rainbow_set4_007_noisy	Throughout the centuries people have explained the rainbow in various ways.
Rainbow_set4_008_noisy	Some have accepted it as a miracle without physical explanation.
Rainbow_set4_009_noisy	To the Hebrews it was a token that there would be no more universal floods.
Rainbow_set4_010_noisy	The Greeks used to imagine that it was a sign from the gods to foretell war or heavy rain.
Rainbow_set4_011_noisy	The Norsemen considered the rainbow as a bridge over which the gods passed from earth to their home in the sky.
Rainbow_set4_012_noisy	Others have tried to explain the phenomenon physically.
Rainbow_set4_013_noisy	Aristotle thought that the rainbow was caused by reflection of the sun's rays by the rain.
Rainbow_set4_014_noisy	Since then physicists have found that it is not reflection,
Rainbow_set4_015_noisy	but refraction by the raindrops which causes the rainbows.
Rainbow_set4_016_noisy	Many complicated ideas about the rainbow have been formed.
Rainbow_set4_017_noisy	The difference in the rainbow depends considerably upon the size of the drops,
Rainbow_set4_018_noisy	and the width of the colored band increases as the size of the drops increases.
Rainbow_set4_019_noisy	The actual primary rainbow observed
Rainbow_set4_020_noisy	is said to be the effect of super-imposition of a number of bows. 
Rainbow_set4_021_noisy	If the red of the second bow falls upon the green of the first,
Rainbow_set4_022_noisy	the result is to give a bow with an abnormally wide yellow band,
Rainbow_set4_023_noisy	since red and green light when mixed form yellow.
Rainbow_set4_024_noisy	This is a very common type of bow,
Rainbow_set4_025_noisy	one showing mainly red and yellow,
Rainbow_set4_026_noisy	with little or no green or blue.