Things I Don't Understand

How:

1. The stock market
2. Computers (binary coding)
3. Robots (circuits)
4. Organic chemistry (Lewis structures)
5. Haircare (shine, volume, thick/thin)
6. Starbucks' menu
7. Golf

Why:

1. Tanning
2. Spinach
3. Beer
4. Avocados/guacamole
5. Uggs
6. "Reality" TV
7. Hair extensions
8. Adrenaline junkies
9. Body building

What do you have trouble understanding? I'll update this list as I encounter "things" I don't get.