This week's feature interview is with David Vinca, Founder, eSpark Learning and Luke Shepard, CTO. eSpark Learning is harnessing the power of educational 3rd party apps to build a platform for customized learning experiences in the classroom. David puts the "minimum" in Minimum Viable Product, explaining how he first tested his idea using a paper version of his app and graduated to Powerpoint and finally what is today, eSpark Learning. Along side him in this interview is Luke Shepard, a past Facebook Developer, and an iterative machine (they push every single frickin day).