Descartes was born in Brittany, France, at the end of the sixteenth century. His father was a local councilman and magistrate.
When he was just over a year old, his mother died of tuberculosis, and he was infected as well. Descartes had been sickly since childhood, but his wealthy family allowed the school to let him read in bed in the mornings.
In 1607, his father hoped Descartes would become a theologian, so he sent him to a seminary when he was eight. In consideration of his frail health, the school exempted him from the rules and allowed him to skip morning classes.
An ordinary child would have been overjoyed, but Descartes obediently chose to study. During that time, he developed an interest in the stars.
Once, Descartes sat on the steps outside his room, gazing at the dim horizon after sunset. A passerby approached and asked, "Hey, clever fellow, how many stars are there in the sky?"
He replied, "Fool! No one can embrace something so boundless."
According to the Berlin Law, after repeated success, people often came to believe they could do anything.
Both Grindelwald and Voldemort believed they could rule the world with magic, but that was impossible.
What Descartes said—"change one's desires rather than the order of the world"—sounded far more reasonable.
After night fell, Pomona arrived at the observatory. Having spent the entire day catching owls, she was covered in owl feathers. She had taken a bath before coming, which made her feel much more comfortable.
There was quite a bit of homework left behind by students observing "candlelight" variable stars in the observatory. Pomona gathered it all up, intending to follow Grubbly-Plank's suggestion and make a gift for Sinistra.
Descartes' heart-shaped function was famous, but his most important contribution was the Cartesius coordinate system,