September 23

Good things only: founding, building, inventing, discovering, freeing, first flights. No wars here.

1846

Neptune is found where the maths said it would be

Johann Galle pointed a telescope at the spot Urbain Le Verrier had calculated and found the planet within an hour, less than one degree from the prediction. It is the clearest case there is of arithmetic discovering something real.

Homeschooling

The long version plus questions, on clean paper.

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