Dr. Esmé Louise James on Instagram: "Victorian Christmas cards were on another level of strange 😳#KinkyHistory The first commercial Christmas card appeared in 1843, so there were really no rules yet. The celebration of Christmas also looked very different than it does today – connected with superstition, the hardship of winter, and moral disorder. This could go some way into explaining the number of 💀 birds… #History #Victorian #HistoryMemes #ChristmasCards"

MathxMatrix on Instagram: "Not all infinities are the same size. This was proven by mathematician Georg Cantor in the late 19th century. To understand how one infinity can be "bigger" than another, we have to change how we define "size." Decimal numbers (specifically "Real Numbers") are Uncountable. Cantor proved this using a famous method called the Diagonal Argument. Imagine you tried to make a list of every decimal between 0 and 1. Cantor showed that no matter how you arrange that list, I can