It’s the start of September, so time to bid adieu to the classic holiday selfie: two brown knees. If it’s on the socials there might be a caption – #bestlife, #bliss – and if it’s in a text it needs no explanation at all, because its message is universal. I am in a hot place. I am doing what I please, mainly supine. I have knees.

Everyone’s knees look the same, which is weird given the sheer variety of body shapes, and everyone’s background is........

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