Q1: In my view, firstly, it's easy to implement in the electronic circuits in which the digits 0 and 1 are represented as voltage levels. Secondly,the binary numbers 0 and 1 are the most suitable for computer storage and computation.

Q2: Always check the bit strings in ASCII to find that the character strings stand for integers or characters. For example, the strings "57" in ASCII stand for the number "9", while the strings "75" in that standard stand for the letter "K".