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Changing the clock back for Daylight Saving Time allows for one full extra hr of light during the day when it would normally be dark.
There are many reasons to change the clock back:
More light =safety
When it's light outside you have less car accidents, burglaries, etc...
In addition , people are more productive with more light, darkness is depressing and has been proven to cause a decrease in productivity.

This was done to save candles before electricity.

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15y ago

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