Realizing
a bit
4We need two states, e.g.
high or
low voltage (e.g. computer chips)
why you should protect computer from power surges
north or
south pole of a magnet (e.g. floppy disks)
why
you should keep floppies away from large magnets
light or
dark (e.g. reading CD or DVD, also laser printers)
hole or no
hole (e.g. punch card or CD)
