Ch2 - Morse code

• it is the combinination of dot and dash like binary code in computer.
• the more dash and dot, the more ability to defined the character, which the number is the power of 2(2^{number of dash and dot}). It is just like binanry number. Ch3 - Braille
• it's the sophisticated algorithm that use 6 dot emboss on the paper to reproduce the writing system.
  • It also uses the precedence(or shift code) for number, capital indicator(or escape code) to make this system a lot versatiles.

Ch4 - Anatomy of a flashlight

• V=IR
• The high conduction element are those that have only one outer electron such as Cu, Ag, Au.
• the wider diameter the more easier for electron to transfer = less resistant
• Transferring electrons lose some energy as heat, the more resistance, the more heat produced.

Ch5 - Communicating around the corner

• We can use the earth as an unlimited electron supply(absorb or provide), it's called "connect to earth or ground".
• The longer the wire the higher resistance.

Ch6 - Logic with Switches