Before continuing, please bear in mind that :

“The opinions or assertions contained herein are the private views of the authors and are not to be construed as official or as reflecting the views of the US Department of the Army, the US Department of Defense, the Department of the Navy or naval services at large.”

A 12-year study (1999 to 2010) analyzed fatality reductions in bicycle-car collisions to determine the effect of mandatory helmet laws. 16 states had bike helmet laws in the beginning or the study. The researchers identified all relevant fatalities, totaling 1612, in states with and without bike helmet laws.
  

Relevance was determined by adjusting for factors previously associated with rates of motor vehicle fatalities (elderly driver licensure laws, legal blood alcohol limit and household income) and, among those, they found that the adjusted fatality rate was significantly lower in states with helmet laws. On average, 900 people die annually in bicycle-motor vehicle collisions — three quarters of those are from head injuries. 

Calibration does not always mean fixing a device, it sometimes means adjusting to solve a problem.  In the early years of America, the famous Kentucky longrifles that conquered the frontier (and some British) had fixed sights. Since they couldn't be adjusted, frontiersmen - Kentucky was part of "The West" then - would adjust for wind, elevation and range by experience.  If their shot was hitting low and left, they aimed high and right. Inference helped them get a better result.

Is the obesity epidemic due to the addictive qualities in food or that a lot more food is cheap and plentiful than ever before in history?

A paper presented at the 2013 Canadian Neuroscience Meeting, the annual meeting of the Canadian Association for Neuroscience - Association Canadienne des Neurosciences (CAN-ACN), says the problem is addiction rather than food wealth - the authors claim that high-fructose corn syrup can cause behavioral reactions in rats similar to those produced by drugs of abuse such as cocaine.  It's the "Food Addiction" hypothesis that has recently become popular, which posits that we could be addicted to food just like drugs.  

It is often believed that mega-events like the Olympics are good for a city or country. Many of the benefits are implied but they still get a monetary value attached when selling it to the public; 'leadership','world-stage', etc. The hangover that occurs economically afterward often leaves host countries wondering who did the math.

But if you are a small charity relying on corporate donations, it may be a good idea to get behind all of those taxpayers underwriting big occasions. Even smaller events like political conventions, and certainly the Super Bowl, deliver a morale-boost in the form of hometown pride and that translates into corporate largess, says a new paper that refutes beliefs that corporate philanthropy remains stable even during high-profile activities.