<http://schema.org/thumbnailUrl>
<https://tctechcrunch2011.files.wordpress.com/2013/04/screen-shot-2013-04-22-at-2-32-40-pm.png?w=150>
<https://techcrunch.com/2013/04/22/education-giant-pearson-continues-digital-push-acquires-flipped-classroom-startup-learning-catalytics/>