+The _Unit of Caring_ author continues:
+
+> If your definition of a 'woman' is one where trans people will be their preferred gender once the tech catches up, then I think you should probably reflect on what actually changes about anyone's lived experience on that magic day when our cyborgs hit your threshold. And if it isn't, then you're stuck asserting that if a woman is cell-for-cell identical to me then she still might not be a 'biological woman'. That's a sign that this isn't actually about biology.
+
+I would rather say that's a sign that we're facing an instance of the [Sorites paradox](https://plato.stanford.edu/entries/sorites-paradox/), the ancient challenge to applying discrete categories to a continuous world. If one grain of sand doesn't make a heap (the argument goes), and the addition of one more grain of sand can't change whether something is a heap, then we can conclude from [the principle of mathematical induction](https://en.wikipedia.org/wiki/Mathematical_induction) that no number _n_ ∈ ℕ of grains make a heap. (Or, alternatively, that the absence of any sand constitutes a ["heap of zero grains"](https://www.lesswrong.com/posts/nso8WXdjHLLHkJKhr/the-conscious-sorites-paradox).)
+
+While the Sorites paradox is certainly an instructive exercise in the philosophy of language, its practical impact seems limited: most people find it more palatable to conclude that that the heap-ness is a somewhat fuzzy concept, rather than that the argument isn't actually about the amount of sand in a location. And if you brought a single grain of sand when someone asked you for a heap, they probably wouldn't hesistate to say, "That's not what I meant by _heap_ in this context _and you know it_."
+
+----
+
+on science being hard: http://slatestarcodex.com/2018/04/04/adult-neurogenesis-a-pointed-review/
+
+on AGP being a different thing: /2017/Jan/the-erotic-target-location-gift/