52 things I learned in 2018
by Kent Hendricks
Januray 11th, 2019
Via Kent Hendricks: "Contrary to popular belief, violent movies actually lead to a slight decline in violence, because, even though people who are likely to commit violent crimes enjoy watching violent movies, they don’t commit violent crimes while sitting in a movie theater. Over a decade, the violent movies led to the direct decline of roughly 1,000 assaults every weekend. (New York Times)
The fake smile—the kind you do for a posed photograph—didn’t exist until the eighteenth century, when the upper classes could afford the services of dentists. (Lisa Feldman Barrett, How Emotions Are Made: The Secret Life of the Brain)
There are strict rules about conversation that cross all languages and cultural boundaries. Of all yes-or-no questions, 75% receive a “yes” and 25% receive a “no.” It takes about 150 milliseconds to respond with “yes,” or “no.” At 650 milliseconds the listener responds with “I don’t know,” and at 835 milliseconds, they’ll say “huh?” or the original speaker will repeat the question. Additionally, the words “uh” and “um” occur about once every 60 words (50 for men and 70 for women), and “uh” is followed by a 250 millisecond pause, while “um” is followed by 670 millisecond pause. (N. J. Enfield, How We Talk: The Inner Workings of Conversation)
The surface area of human lungs is as big as a tennis court. (James Gleick, Chaos: Making a New Science)
People spend roughly one hour each day traveling or commuting, regardless of city size or form of transportation. This is called Marchetti’s constant. Whenever faster forms of transportation have been invented—the domestication of horses, the invention of trains, cars, and then planes—people do not reduce the amount of time spent commuting, they simply commute farther. Walking speed is around 5 km per hour, so the maximum size of a walking city is roughly 20 square kilometers; there are no large ancient cities built prior to 1800 larger than this. As transportation has become faster, and transportation networks have expanded, the physical size of cities has expanded in direct proportion. When people spend less time commuting or work at home, they make up for in it other days, including by going on walks that last as long as the remaining time that would be allotted for commutes. Even people stuck within the confines of prison spend around an hour a day walking around. (Wikipedia)"