छठी कक्षा के बच्चों के लिए आत्मकथा के टॉपिक
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Why do we use the a.m.-p.m. system for telling time? ... Early mechanical clocks showed all 24 hours, but over time, clockmakers found the 12-hour system simpler and cheaper. Of course, a.m. stands for ante meridiem, which is Latin for "before midday." And p.m. means post meridiem — "after midday.
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yes I am in 6th class student
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