Infinite series: When the sum of all positive integers is a small negative fraction.
Simply the Most Astonishing #Math You’ll Ever See: 1+2+3+4+… = -1/12
http://www.slate.com/blogs/bad_astronomy/2014/01/17/infinite_series_when_the_sum_of_all_positive_integers_is_a_small_negative.html & http://en.wikipedia.org/wiki/1_%2B_2_%2B_3_%2B_4_%2B_%E2%8B%AF HT @Tomorrow_Lab