The caption below the figure reads:
People invented branch grafting in gardening to solve the problem of getting "strong roots" fast. We don't have anything like that to improve the lot of poor kids. Will digital books help solve this problem? Probably not, but it could be an element of the solution.
Another thought: this pattern might work for regular kids too. That is, investing in early stages of development can be very efficient, but not obvious enough for a quick fix - it just takes years and years before the results become visible.
tags: education, problem, information, control, health, system, synthesis
References: James J. Heckman. Skill Formation and the Economics of Investing in Disadvantaged Children. Science. 2006 Jun 30;312(5782):1900-2.