In color theory, a purple is defined as any non-spectral color between violet and red (excluding violet and red themselves). The spectral colors violet and indigo are not purples according to color theory, but they are purples according to common English usage since they are between red and blue.
Apex Learning was started in 1997 by Microsoft co-founder Paul Allen on the idea that online courses and test prep, which were already succeeding in higher education, could be applied to K-12.
By Helena de Bertodano. 9:00AM BST 28 Sep 2012. What Salman Khan, the founder of the non-profit online school Khan Academy, has to say to the parent of an 11-year-old is frankly terrifying: 'If your child is not placed in the fast track for math in sixth grade, his chances of going to Stanford are close to zero.