2018 calendar

I love the The Mathematics Calendar 2018. Math Calendar sample days It has an equation or other statement about math for every day, often linked to that day (like, the January 13th entry is "the sixth prime number"). Some entries are little mat quizzes for you to fugue out. Some are funny jokes, like the entry for Thanksgiving (any guesses as to what that might be? Hint: It is a formula.) The level of difficulty of understanding the reference or solving the problem ranges from suitable for a smart 7 year old (Huxley has figured some out) up through college level. Also, the picture that…