20% Drop in Gun-Related Injuries During NRA Conventions

Among 75,567,650 beneficiary-period observations in the claims analysis, 14.3% occurred on NRA convention dates. The unadjusted rate of firearm injuries was lower during convention dates than during control dates (129 beneficiaries with a firearm injury among 10,883,304 persons [1.19 per 100,000] vs. 963 beneficiaries with a firearm injury among 64,683,254 persons [1.49 per 100,000]; P=0.004; relative difference, 20.1%; 95% confidence interval, 6.7 to 34.0). The findings were unaffected by ad...

 WHO Exercise Guidelines

In order to improve cardiorespiratory and muscular fitness, bone health, reduce the risk of NCDs and depression: 1. Adults aged 18–64 should do at least 150 minutes of moderate-intensity aerobic physical activity throughout the week or do at least 75 minutes of vigorous-intensity aerobic physical activity throughout the week or an equivalent combination of moderate- and vigorous-intensity activity. 2. Aerobic activity should be performed in bouts of at least 10 minutes duration. For addit...

 Vaccines as a Positive Externality

A science-based example of a positive externality is vaccinations. Vaccinations work based on the number of people in the population who are vaccinated. Once a certain threshold is reached, the disease can't spread effectively and is essentially eliminated. As long as enough people are vaccinated, others who choose not to be still get to enjoy that positive externality at no cost. These are what economists call freeloaders. Economists like the golden rule: Do unto others as you would have the...