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Manfred comments on Two books by Celia Green - Less Wrong
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Starting Advice to Clever Children. I'm certainly reminded a bit of Eliezer's writing style :) But this is perhaps a style that makes more historical sense in 1980 Oxford anyhow. The life story she starts with certainly does ring bells, if caricatured bells.
And then we hit this: "I may mention that by the age of thirteen my philosophical thinking was, essentially, complete." Sanctified Sicilian sweets, Chiroptera homo. Or as Scooby would say, ruh roh raggy.
Updates: Oh deary dear.
Okay, page 38, nonsense physics, I'm out.
But antiparticles do move in the opposite direction. (It was Gamow who called positrons "donkey electrons".) The weakness in the exposition is that, even before antimatter was discovered, we knew that electric charge can be positive as well as negative, and so that the same force is experienced as a push by one particle but as a pull by another particle. So any assumption that the direction of a force is necessarily the same as the direction of the motion it induces was revealed to be wrong, not when antimatter was discovered, but some time earlier.
Yes, in 1929.
And, of course, F = dp/dt.