Things about the Song Dynasty: A glimpse into Song people’s views on marriage and love from "Do you know, do you know, they should be green, fat, red and thin"
When the concubine of Emperor Jing of the Han Dynasty came to have her period, she arranged for the maids around her to sleep with her, and an idiom was born.
Understand the application of Ohm's law in shunting in parallel circuits with one question ~ Detailed explanation of junior high school physics and electricity textbook questions