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Why do people fear Friday the 13th?
Some people believe Friday the 13th is bad luck. Same way with black cats with green eyes and umbrellas when there opened inside a building. Hopefully this helps :)
How many the Friday the 13th are there in a year?
Every year is different. 2009 had three such days, whereas 2010 shall only have one, while 2012 will have three. It is like your birthday, never on the same day of the week.
Why doesn't every month have the same amount of days?
Since there are 365.25 days in a year (approximately, if every month had the same number of days, the calendar would soon be out of synch with the seasons.
What is the difference between linear and exponential population growth?
Linear growth: The population adds the same number every week/month/year.Exponential growth: The population multiplies bythe same number every week/month/year.
How many days are there in March 2012?
The month of March has 31 days in 2012, and it has 31 days every year. In fact, the only month that does not always have the same number of days every year is February. That is the only month whose length varies. All the others have a fixed length.
