Math Links for Week Ending July 1st, 2016

A few from @mathequalslove. I like this puzzle for functions where the simple premiss is that for each card you place integers from -4 to +4 to make the statements true. The other one is for dealing with whether a relation is a function or not by placing the integers from -4 to +4 too. These take some time to make up so I love it when people share their activities so that we can save that time ourselves. Nicely done.
Curriculum Tags: MCR3U, MCF3M
http://mathequalslove.blogspot.ca/2016/06/evaluating-functions-puzzles-open.html
http://mathequalslove.blogspot.ca/2016/06/functionnot-function-open-middle-problem.html

The first time I heard of Happy Numbers was in the book "Adam Spencer's Big Book of Numbers". in this task, @MarkChubb3 uses the concept of happy numbers to have students practice perfect squares.
Curriculum Tags: Gr7, Gr8
https://buildingmathematicians.wordpress..../happy-numbers/







If you ever want to give students an example of the dangers of exponential growth then this story of a hacker who's "worm" inadvertently shut down the most popular site on the Internet (at the time) and did so because it grew exponentially. Listen to his story (starting at 1:19:17 ) on how he shut down MySpace (this was clearly a while ago) and how it eventually got him banned from using computers. @SamyKamkar is a hacker and he is being interviewed by venture capitalist and self experimenter @tferriss. It's a great (and long) podcast but the story in question starts at 1:19:17. Have a listen.
Curriculum Tags: MCF3M, MCR3U, MBF3C
http://fourhourworkweek.com/2015/05/02/samy-kamkar/

Some new activities pointed out on the @Desmos Friday Five. A few from the last few weeks that I liked were Put the Point on the Line which gives a nice intuitive way to introduce the idea of slope a neat little scatter plot activity called Commuting Times that includes a Which One Doesn't Belong at the end. I also like Parabola Slalom which makes good use of the new sketch feature. And on today's Friday Five there are a bunch of previously shown activities all dealing with parabolas, like Match my Parabola or Will it Hit the Hoop.
Curriculum Tags: MFM1P, MPM1D, MPM2D, MFM2P, MCR3U, MCF3M, MBF3C, MDM4U, MAP4C
http://blog.desmos.com/post/146081323386/friday-five-for-june-17
http://blog.desmos.com/post/146425856530/friday-five-for-june-24
http://blog.desmos.com/post/146753569437/friday-five-for-july-1

This is older but still quite relevant to 3D point plotting. I think it's could be a nice application of 3D vectors.
Curriculum Tags: MCV4U
https://www.youtube.com/watch?v=HVhVClFMg6Y

Who doesn't like geometry in nature. Thanks to @KMarkPet for this one
Curriculum Tags: All
http://timewheel.net/image-25-stunning-photographs-of-sacred-geometry-and-fractals-in/