The idea occurred to me last night that to solve the spam problem, we could give up on email and instead print letters on paper and have them delivered via the post--and that this would constitute progress.
I get, on average, about 1.5 credit card offers per day in the postal mail. I was so curious about how much content in our postal mail was even of use that I actually started weighing it. Over a couple of days, useful content was only about 30% on a mass/mass basis.
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