Speaking of the abacus, my grandmother suddenly asked me on a whim: "Liang Zai, do you know who invented the abacus?" ”

I shook my head. I know that the four great inventions of China are the compass, gunpowder, movable type printing and papermaking, and I know from history textbooks that printing was invented by Bi Sheng in the Song Dynasty and papermaking was invented by Cai Lun in the Han Dynasty. As for the compass and gunpowder, I don't know who invented them.

In fact, I have long thought that the invention of the abacus and the lunar calendar should be as great as the four great inventions. The abacus simplifies the calculations of the Chinese for thousands of years, and the lunar calendar is even more magical

"I Went Ghost Hunting with Grandpa" Chapter 305 is closely related is in the middle of the hand, please wait a moment,

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