Curated Video
HOLIDAY RIDDLE - In The "12 Days Of Christmas," How Many Total Gifts Are Given?
You may remember the song "12 Days of Christmas" in which each day you get N gifts, plus all the gifts from the preceding days. How many gifts are given in total? What's a general formula? Algebraic proof...
Curated Video
When Is Christmas? Mentally Convert Date To Day Of The Week
January 1, 2016 is a Friday. When will Christmas be in 2016? What about Christmas in 2055? You can do this in your head! Blog post (text explanation): http://wp.me/p6aMk-4qQ Doomsday Rule (previous video):...
The Royal Institution
The Monty Hall Problem - Christmas Lectures with Ian Stewart
Ian Stewart explains the Monty Hall problem and its solution. Subscribe for regular science videos: http://bit.ly/RiSubscRibe The Monty Hall problem became infamous in the 1990s where newspaper columnist and puzzle solver Marilyn vos...
Curated Video
Calculate The Day Of The Week For Any Date Until 2099
January 1, 2015 is a Thursday. When will Christmas be in 2015? You can do this in your head! Doomsday Rule http://en.wikipedia.org/wiki/Doomsday_rule Calculating the day New Years (1/1) occurs https://www.youtube.com/watch?v=7iZ1TlqcqVc...