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I would not have guessed the gap was so large. Part of it is easy to under­stand — every­one needs health care but edu­ca­tion tends to be lim­it­ed to cer­tain stages of life. But that only gets you to a 20–1 or so ratio. 

Ques­tions that are rarely asked

It is esti­mat­ed that less than $1B is spent in the U.S. each year on edu­ca­tion research, with the fed­er­al gov­ern­ment spend­ing about $700M and uni­ver­si­ties, foun­da­tions and the pri­vate sec­tor spend­ing …