Ok, the whole book title is The 4-Percent Universe: Dark Matter, Dark Energy, and the Race to Discover the Rest of Reality. This book documented the process of how two different teams of scientists discovered that the expansion of the universe is accelerating back in 1998. If you are interested in the sociology of how different scientific disciplines do their work, this would be of interest. The author explained how the astronomers did group-based work quite differently from the physicists.

For example, on page 229, one can read this. “The core of White’s argument was that astronomy and particle physics constituted two different cultures. Astronomers, White said, were ‘generalists,’ exploring the complexities of the universe on a case-by-case basis. Particle physicists were ‘fundamentalists,’ wringing the complexities of the universe in the hope of squeezing out an ‘ultimate foundation’—a ‘Truth.’ ‘Dark Energy,’ he wrote, ‘is a unique link between them, reflecting deep aspects of the Fundamental Theory, yet apparently accessible only through astronomical observation.'” (From https://millstonenews.com/wp-content/uploads/2014/05/panek4PercentUniverse.pdf)

The book covered dozens and dozens of scientists, and I got lost trying to keep track of them all in my head. I probably should have taken notes. Pictures of the scientists involved might have helped me keep track of them all.

Overall, if you are interested in learning more about dark energy, and how different scientific teams work together (or not), then this book would be a worthwhile read.