By reading this article, you can know whether you are a left brain or right brain. Click here if you want to know
I think you've heard the terms left-brain and right-brain. What does this mean?
I would like to tell you what each feature is and how to find out which one you are.
Read this article to learn about the history of mathematics and how the abacus has evolved.
You can know the calculation method before BC and the prototype of the abacus.
If you want to know the history of the abacus, please take a look.