Day 4 consisted of wrapping up the discussion of HSB, introducing the RGB model, and setting the groundwork for the upcoming discussion of physics.

**Review of of Hue, Saturation, and Brightness**- HSB cylinder

**Additive color mixing**: We organized our observations of mixing of colored light from the previous class and introduced the RGB color model.- Primary colors in additive mixing
- Complementary colors in the additive system
- RBG color model
- RGB cube

**Measurement in physics**:- What is science?
- Units and unit conversions
- Scientific notation and orders of magnitude. We watched Powers of Ten to get a better sense of what different powers of ten mean in terms of different scales, so that we can assess our answers to numerical problems.

**Other Resources:** A student pointed me to an interactive catalog of objects of a vast range of sizes, organized by powers of ten **http://htwins.net/scale2/**