Carroll is turning that series, “The Biggest Ideas in the Universe,” into a namesake book trilogy. Q&ASean CarrollGAZETTE: You said you started your video series to help keep people connected during the surreal early days of the pandemic. GAZETTE: It also seems like you’ve invented a whole new genre, something between a popular science book and a textbook. Science is not just a set of final answers; it’s a way of thinking about the world and learning new things. In the book, we learn Newtonian mechanics, then a whole other way of doing it, called Hamiltonian mechanics, and then another way, Lagrangian mechanics.