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Today on Google's home page is a fun interactive pH scale, a scale for measuring acidity and alkalinity, remembering S.P.L. Sørensen. He was a Danish chemist born on January 9, 1868 in Havrebjerg, Denmark and died at the age of 71 on February 12, 1939 in Copenhagen, Denmark.
The interactive Doodle lets you play a game deciding which item belongs on which side of the pH scale. Spicier items more on the left and the others on the right.
I am honestly not sure why the Doodle is up today on May 29th.
Here is the GIF version:
Anyway, you can learn more about S.P.L. Sørensen at Wikipedia.
Forum discussion at Twitter.
