What did the Incans of Peru, used to measure time, treat injuries, predict weather, and make childbirth easier?

Icecream Sundae's were first created in late 1800s to Circumvent "blue laws" that:

Low carb, sugar free snickerdoodle cookies

A social subsidy provided to purchase peach schnapps

A ridiculous idea that only sounds good when you're drunk

Random 17-year-old kid, who got B- on the assignment