You're trapped in a dark castle with a pile of gold coins that a wizard will only allow you to leave with if you can solve his riddle. Math learners solve the riddle of the dark coin with the help of an engaging instructional video.

Standard error means ... it's okay to be wrong? Viewers learn how to calculate standard error from the standard deviation and the number of data values, both by hand and by using spreadsheets. The video also shows how to display this...

In the video George Measures Up, Curious George needs to measure a tall building for Chef Psighetti. First he uses himself and then realizes he can use a measuring tape instead. As children explore the concepts of measuring, they learn...