Rain's Dirty Little Secret

Want to learn more about the topic in this week's video? Here are some key words/phrases to get your googling started:
- Condensation - the process of water molecules glomming together into visible droplets
- Condensation nuclei - tiny solid particles that water vapor condenses onto (also called aerosols)
- Homogenous condensation - condensation without any kind of condensation nuclei
- Dew point - the temperature below which water vapor starts to condense into droplets
- Heterogenous condensation - condensation that happens with the help of condensation nuclei
- Critical Embryo - a cluster of water molecules big enough to easily gain more molecules
- Cloud chamber - a cool thing to check out if you want to build a particle detector at home (it involves pumping a bunch of water vapor into pure air; when a particle passes through, it leaves a streak of ionized water molecules that, in super-saturated air, can act as condensation nuclei!)