Why does our calendar include leap year?
Why do we have a leap year?
How many days are in a leap year? What leap years have we had since 2000? What is a "non-leap year"? How many leap years are there in a century and why? How many leap years are there in 2000 years and why? Is 40,000 A.D. a leap year? Why is 2100 not a leap year? What is the logic behind 2100 AD not being a leap year? Why does only February has 1 extra day in leap year? What's the probability that a leap year has 53 Sundays? What is the probability that a leap year will have 53 Sundays and 53 Mondays? Why do we have to grow up? What's the probability that a leap year has 53 fridays or 53 saturdays? Why are we growing up? What's the probability that any non-leap year has 53 fridays? In a non-leap year, which is greater: the mean number of days per month or the median number of days per month? Do New Years' resolutions work? Why or why not? When are we growing up? Why do we celebrate 21st birthdays? Why do we become old? Do you make New Years resolutions? Why or why not? What is the probability that a non leap year has 52 Sundays? Why don't New Year's resolutions work? Why is there a difference between a solar year and a sidereal year? How did celebrating the new year start? Why don't New Year's resolutions ever work? Why did the baby boom happen? Why do we celebrate our birthdays? Does everyone have a growth spurt? Why or why not? How was your new year celebrations?