Granted. History is altered so Newton and Leibniz are murdered before either has a chance to come up with anything resembling calculus, and anyone toying with the same ideas meets an identical fate.
Since so much of our current science and technology depends on calculus, we stay at an 18th-century level forever. Gotta enjoy the high infant mortality, the short life expectancy and the persistence of ancient social mores only technological progress enabled us to change. Needless to say, there was never a French Revolution, the Ancient Regime never fell, and the US never existed. I guess you can, at least, be glad the metric system was never devised; instead, since the British empire has been so big for such a long time, the whole world eventually adopted its imperial system of measurement units.
I wish I had it easier to replace my ancient computer.
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The red lake has been forgotten. A dust devil stuns you long enough to shroud forever those last shards of wisdom. The breeze rocking this forlorn wasteland whispers in your ears, “Não resta mais que uma sombra”.