Flutterby™! : Moms teach math

Via Philip Greenspun comes Figure 1-2 from the NSF Science and Engineering Indicators 2010 report:

At this scale it's hard to read (click to zoom) but the black bar on the left is "Bachelor's degree or higher", the pink bar on the right "less than high school", the bar groups are subject.

Seems like moms, not schools, teach kids math.