As Foursquare becomes more and more popular, so is the sidewalk chalkboard sign beckoning Foursquare users into the local coffee shop or bar and hailing the store’s current Mayor. While the chalkboard ...
The use of chalkboards for pedagogical purposes is widely credited to one James Pillans, a 19th century Scottish geography teacher who, in 1801, hung a large slab of slate on his classroom wall and ...
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