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In general, when theories are easily variable in the sense I have described, experimental testing is almost useless for correcting their errors. I call such theories *bad explanations.* Being proved wrong by experiment, and changing the theories to other bad explanations, does not get their holders one jot closer to the truth.
The Beginning of Infinity
David Deutsch
I also saw how, throughout time and in all countries, the people who have the wealth are the people who own the means of wealth production. In order to maintain or increase their wealth, they work with the people who have the political power, who are in a symbiotic relationship with them, to set and enforce the rules. I saw how this happened similarly across countries and across time.
Principles for Dealing With the Changing World Order
Ray Dalio
One often underappreciated risk with aggressively A/B testing emails and push notifications is that it results in users opting out of the channel; and even if you kill the test, those users remain opted out forever. Do this many times, and you’ve destroyed your channel.
How Duolingo reignited user growth - by Jorge Mazal
How Duolingo reignited user growth
Jorge Mazal
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