A study published in 2015 suggests that mass shootings in the U.S. are contagious. Not in a sense of spreading like a disease, however — just that each shooting slightly increasing the chance of another one happening shortly afterward.
The original article used data from the Brady Campaign to Prevent Gun Violence. It appears that we now have much more complete data on shootings, thanks mostly to the Gun Violence Archive project. Additionally, it should be interesting to see if the findings still hold true.
Here’s the chart showing how the average number of mass shooting per day changed in the past two years. The graph below has been smoothed using a rolling average with gaussian weights and a 60-day window.
For our readers who are unfamiliar with Apple Pay, here is a definition: Apple Pay is a mobile payment (digital wallet) service by Apple Inc. that lets users make payments using every Apple device that you can find. The service was launched in the United States about two and a half years ago. If you didn’t know about it, you are not alone. According to information published at Statista.com in August 2016, about 9 percent of millennials in the United States have never heard of this service either (as well as 9 percent of Generation X respondents, 17 percent of baby boomers and 22 percent of retirees).
Many people have also heard of this service but never used it: 66 percent of millennials, 71 percent of Generation Xers, 80 percent of baby boomers and 76 percent of retirees. Only 2 percent of retirees used this digital payment service, the lowest rate of all the respondent groups. Three percent of baby boomers used Apple Pay in 2016. Approximately 19 percent of Generation Xers said that they used Apple Pay. The highest level of familiarity with Apple Pay was recorded among millennials — 25 percent of these respondents stated that they used it.