That's why Facebook posts like one I saw recently drive me absolutely insane. This particular post says that 2016 is a special year and that because there are 4 Sundays, 4 Mondays, 4 Tuesdays, 4 Wednesdays, 4 Thursdays, 4 Fridays and 4 Saturdays another one won't happen for another 823 years. Wow that sounds really special. Until you look at the actually facts. Every February has at the bare minimum 4 Sundays, 4 Mondays, 4 Tuesdays, 4 Wednesdays, 4 Thursdays, 4 Fridays, 4 Saturdays. The only exception is when there is a leap year. This year February has 5 Mondays. Also the idea that this year won't be repeated again until 2839 is false. 2839 will have no leap year for instance. And the calendar (with a few minor deviations given the fact not every 4th year is a leap year- 1700, 1800, 1900, 2100, 2200 are not leap years but 2000 was a leap year) re-occurs in 28 year cycles. So 2016's calendar is exactly like 1960's, 1988's, 2044's, and 2072's calendar. The idea that this calendar won't happen again for 823 years is just wrong. But the gullible seeing this post and not thinking about it, will re-post it over and over again. It is just junk thinking which pollutes our newsfeed.