Quantum physics is the next level up in our description of the universe; it describes how the point particles of the Standard Model (and others not included in the Standard Model) interact with each other at a scale larger than themselves.

When we first look at the ideas known as quantum physics, it is hard to believe that physicists seriously proposed them. One of the cornerstone concepts is that everything we know as matter and energy is made up of little pieces (or particles) known as quanta. This idea is not too troubling because we are already accustomed to the notions of atoms and the constituents that make them up - protons, neutrons, and electrons. But then, energy is supposed to be made up of particles too!

Energy as particles may not make much sense, but then quantum physics is supposed to be a radical new theory. However, quantum physics then immediately says that these particles act like waves! Well, we might believe particles or we might believe waves, but what can it mean to be both? Do they pick whether they act as particles in some situations and waves in others? (Not too far off from what is said...) How do they "know" when to choose which behavior? How can they choose? Do they think?