is a behind-the-scenes look at one of the hottest and fastest-moving areas of astrophysics today: simulations of cosmology and galaxy formation. Leading cosmologist Romeel Davé guides you through the trials and tribulations of what it takes to teach computers how galaxies form, the amazing insights revealed by cosmological simulations, and the many mysteries yet to be solved. This rollicking journey is a rare glimpse into science in action, showing how cosmologists are using supercomputers to uncover the secrets of how the universe came to be.