Math Teachers at Play 23

Matht Eacher Sat Play 23 is up at Math Recreation.  Nice 23 theme and a couple cool 23 facts.  My entry is the recent money post.  But you will also find:

• Very cool post about young children learning number with a deceptive title: Infinity Plus One at republic of math.
• Sue's most recent Math Salon.   Great culture building. 
• Two related posts on binder checks as assessment.  I wish more people wrote about assessment and evaluation.  (Don't think I have either, though.)  The second is at one of my favorite blogs, the unflinchingly honest f(t).
• Lots more good stuff, of course.