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Chicago St. Patrick’s Day Parade

Chicago has historically been home to innumerable people of Irish descent. Therefore, it is only natural that this city should...

Leap Year

For the earth to rotate about the sun takes exactly 365 days 5 hours 48 minutes and 45.9678 seconds, or...

Moh’s Hardness Scale

Hardness is the measure of one structure hardness against another. French mineralologist proposed a relative scale to measure one substances...

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