There are almost no just-plain-true (or false) facts in the macroscopic natural world. We’ve engineered our environment to support deductive reasoning, which doesn’t work in nature. Text from Elijah Millgram’s _Hard Truths_pic.twitter.com/e6HLMSjpb3
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Strangely, nothing is coming immediately to mind. There’s a long section on this in the book I’m writing now, but that won’t be available for a while yet.
The AIDS example is a good one though. AIDS is defined as “various diseases caused by HIV” and HIV is defined as “various viruses, not particularly closely related, that cause AIDS.” And “causes” is not really defined at all (which is a big problem in the philosophy of science).
The issue here is not word meanings, but things-in-the-world, i.e. the relationship between HIV and AIDS is just inherently messy—but quite certain.
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