Our “common sense” understanding of the composition and basic laws of Nature is built on experiences with every day “medium-sized” objects. In the 20^th century, physicists learned that if we peer inside the nucleus or into the vastness of space we find very different laws and compositions that often strike us as weird and bizarre. Perhaps surprisingly, understanding the cosmic weirdness helps us understand the subatomic weirdness, and vice versa. In this talk we will explore the universe in an imaginary journey from the present day to the Big Bang and back again.