【note】
If you are curious about the equation in 10:22, please refer the blog posting : https://dmtpark.tistory.com/5. I'm sorry that there is no translated version of this posting. Please use online translator if you want.

【erratum】
— (2:02), (9:28) safetly → safely
— (9:18) 6.626×10^(-34) → 1.055×10^(-34)