what is sound?
==============

attributes of waves:

| waves <div style="display: inline-block; width: 50px;"></div> | sounds <div style="display: inline-block; width: 10px;"></div> | |
|-------------|--------------------|----------------------------------|
| `amplitude` | `volume`           | how far does the wave fluctuate? |
| `frequency` | `pitch`            | how often does the wave repeat?  |
| `shape`     | `timbre`           | (literally just the shape)       |

...let's look at + hear some examples!
