Greenhaus Education and Other "Effects"

In perusing the internet for edtech and math news of interest, I came across Sony Global Education Inc.' s Global Math Challenge.   On September 27 you can get online, take a brainteaser math test, competing against mathematicians (young and old) all over the world.  Wow! According the the description, " GMC is full of beautiful illustrations, helping to put math puzzles into a real-world context". This is true if you look at the sample.  You can sign up for the free-Trial Plan, where you will just get your score, or the Standard Plan, in which you actually get to review your results and compare your results with all the other competitors. There are some sample questions for you to 'try it out' before signing up.  Which of course I did.... I was much relieved to find I could actually answer them, though I did get #3 wrong because I misinterpreted the question (I assumed we started from 2, vs. using the given five already assembled). What I loved was t...