Humans help train various dog breeds to enter in competitions such as breed shows, agility and obedience contests, racing and sled pulling.

The origin of apples traces back to the Middle East over 4,000 years ago.

After the Krakatoa volcano eruption in 1883 in Indonesia, many people reported that, because of the dust, the sunset appeared green and the moon blue. The moon was said to appear blue for almost two years.

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