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Fun Holidays on February 7

Fun Holidays on February 7 – Send a Card to a Friend Day, e-Day

Young woman buying a postcard.
Send a Card to a Friend Day
Send a note to a friend to say hello.
Euler's number (e) written on parchment or yellowed paper.
e-Day
Held either January 27 or February 7, this mathematical holiday celebrates the constant e.