The matter we interact with everyday is made up of well-understood particles like electrons and quarks. However, 95% of the universe is made of invisible dark matter and energy! In this class we will learn about what particle physicists do and explore the ways that they look for new particles. We will discuss what dark matter is, the evidence for its existence, and the ways that people are trying to detect invisible particles. Often such experiments require working in a very cold environment. For this reason, we will finish by making liquid nitrogen ice cream to demonstrate the cool science that can happen at low temperatures!