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.
Nissan boss on the secrets of success by The Journal (Newcastle, England). An outgrowth of the Nemeth Braille Code of Mathematics and Science Notation, which was first published in 1965, was developed over a period of 10 years by Abraham Nemeth and is designed to render both literary and technical texts.