Arguably, the most important issue in physics today is trying to unify the twin pillars of modern physics, quantum theory and general relativity, into a single theory known as quantum gravity. This introductory presentation will discuss various aspects of quantum gravity.
The world as experienced by single atoms is radically different from the everyday world we, as gigantic humans, are used to: the laws of quantum mechanics replace the laws of classical physics. Because the quantum realm is alien from our daily experience, many common quantum effects are surprising and unintuitive. To understand the quantum world, it may be better to just start from scratch, as a child might, and develop intuition about the behavior of quantum objects by simply looking at a series of quantum examples rather than trying to analogize with classical physics.