CSI
Physical; most of what we see and can touch is solid
You walk into a room with a match, a karosene lamp, a candle, and a fireplace. Which do you light first?
(any example works)
- evidence in general
- prints
Physical; examples include water, juice, milk, etc.
- detective
- paramedics
- firefighter
Often invisible, untouchable; examples include water vapor, carbon dioxide
DNA
Going to court
a substance created by the combination of other substances
If there are 3 apples and you take away 2, how many do you have?