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If you hang out on #biketwitter there's a decent chance you've seen it before but thought it might be useful to quickly discuss. The Hierarchy of Controls is one of the more powerful tools to understand why bike helmets are not the safety solution our culture pretends they are. 
The Hierarchy of Controls is used by governments and industries worldwide. It's a proven, systematic approach to protecting workers by controlling exposures to occupational hazards. This informs how safety is pursued on construction sites, factories, and tons of other situations.
If you stare at this inverted triangle, the executive summary is that decades of practice have determined that the stuff at the top is way more effective of impacting safety than the stuff at the bottom.
