Reblog: Talking with Kids about Water

Compared to many places in the world,  the United States,even the desert Southwest,  (still) has access to adequate water.   No one can say what the future will foretell.  In the meanwhile, see how most the world survives without easy access to safe, clean water. (via Talking with Kids about Water


A Palindromic Magic Square for the Year 2019

Although math is a language, it has never been one I am fluent in. This ‘magic’ square is never something I could come up with and it is interesting.

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2019 palinhdromic magic square.png

The above 4 × 4 magic square only has the digits 2, 0. 1, and 9 (from the year 2019) and as a bonus, the four digits in its upper-left section form “2019”. It has a magic sum of 132. This means the sums of the magic square’s columns, rows, and diagonals are all equal to 132. It is also a semi-pandiagonal magic square since it contains some of the features of a pandiagonal magic square, namely:

  • Partial Panmagic Square — The 2-2 broken diagonals (on both sides) of this magic square have a magic sum of 132 as well. For this to be a panmagic square, the 3-1 broken diagonals should also be equal to the magic sum, but unfortunately, this magic square does not have that property. From here on, note that the sum of the cells with identical background colors is equivalent to the magic sum, which…

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