Excellent article, really helped me learn. I'd like to add a correction. The binary/ascii/utf-8 value of 'a' (hex 0x61) is not 01010111, but instead 01100001.

Excellent article, really helped me learn. I'd like to add a correction. The binary/ascii/utf-8 value of 'a' (hex 0x61) is not 01010111, but instead 01100001. This is used incorrectly in both the Giant reference card, and in the "ascii encoding" diagram above it.