Today Upfront Ventures is announcing that we’ve backed Rebecca Kantar’s startup Imbellus, a company designed to assess human potential and ultimately change the way we teach children. We led a $4 million investment along with Thrive Capital, GLG and Sound Ventures. The news blogs will cover the what, how and how much but I want to focus on the “why” and try to be instructive of what I think makes for a great A-round startup.