Wanna blow people’s minds WITHOUT the help of your Michael Jackson calendar?
5 Amazing Wizard Tricks You Can Do With Basic Math

#2. Quickly Calculate the Weekday for Anyone’s Birthday
Eminent mathematician John Conway devised a clever shortcut that he (somewhat overdramatically) named the doomsday rule. Crack open a 2014 calendar and you’ll see that 4/4, 6/6, 8/8, 10/10, and 12/12 all land on the same weekday: Friday. The same goes for other easy-to-remember dates like 5/9 and 9/5, 7/11 and 11/7, the last day of February, Pi Day, July 4, Halloween, and Michael Jackson’s birthday (August 29, as you know). Again, all Fridays.
In 2013, those were all Thursdays…

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Wanna blow people’s minds WITHOUT the help of your Michael Jackson calendar?

5 Amazing Wizard Tricks You Can Do With Basic Math

#2. Quickly Calculate the Weekday for Anyone’s Birthday

Eminent mathematician John Conway devised a clever shortcut that he (somewhat overdramatically) named the doomsday rule. Crack open a 2014 calendar and you’ll see that 4/4, 6/6, 8/8, 10/10, and 12/12 all land on the same weekday: Friday. The same goes for other easy-to-remember dates like 5/9 and 9/5, 7/11 and 11/7, the last day of February, Pi Day, July 4, Halloween, and Michael Jackson’s birthday (August 29, as you know). Again, all Fridays.

In 2013, those were all Thursdays…

Read More

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