Just Some Fun or Practical Tidbits Today

a)  Do you ever need some free mathematical clip-art? ...this blogger has a site-recommendation:
http://mathequalslove.blogspot.com/2015/04/stuff-worth-sharing-mathematical-clipart.html

b)  An interesting historical math tidbit from Open Culture (via Cliff Pickover):
http://www.openculture.com/2015/04/shortest-known-paper-in-a-serious-math-journal.html

c)  AMS blogs recommends a few mathematical 'online toolboxes':
http://blogs.ams.org/blogonmathblogs/2015/04/13/online-toolbox-for-number-theorists/#sthash.7ETz1Ulm.dpbs

d)  And lastly, Presh Talwalkar explains that brain-rattling Singapore logic problem that went viral:
http://mindyourdecisions.com/blog/2015/04/14/when-is-cheryls-birthday-answer-to-viral-math-puzzle/#.VSzrwWb5Vo4