Add Yahoo as a preferred source to see more of our stories on Google. A video of a 12-year-old boy crying in frustration as his 9-year-old sister refuses to let him teach her math has gone viral on ...

My kids used to love math. Now it makes them cry. Thanks standardized testing and common core!— Louis C.K. (@louisck) April 28, 2014 Comedian Louis C.K. doesn’t seem to be a fan of Common Core. In a ...