5 karma · joined May 5, 2019
https://ourworldindata.org/happiness-and-life-satisfaction
The second chart of the page shows the share of people who say they are either very happy or mostly happy, click on "Map" in the bottom right corner to see all the countries for which data is available.
Sample: US: 90 percent say they are happy China: 85 % Ethiopia: 63 %
Even without looking at data, the author should consider that his patients come to him to specifically talk about their problems, and not what is going well in their life. It gives him a skewed perspective.
Say you have decided to brush up on your first grade math, and you make a card for multiplication. Instead of just making one "2 2 = 4" card, you make one card containing three potential questions, so you add "5 4 = 20" and "3 * 3 = 9" to the same card. Each time this card is scheduled to appear, Anki will randomly choose one of the questions to display.
This way you prevent your memory from overfitting to the irrelevant context and force it to remember the actual concept, because you have to use your knowledge of how multiplication works every time. You have to pick a large enough selection of possible questions for that to work, for me three is usually enough. Additional bonus : anki reviews get less tedious, because you don't feel like always seeing the same old stuff.
Here's a template for creating such cards: https://ankiweb.net/shared/info/947272864