Gould's final essay collection is based on his remarkable series for Natural History magazine--exactly 300 consecutive essays, with never a month missed, published from 1974 to 2001. Both an intellectually thrilling journey into the nature of scientific discovery and the most personal book he ever published.
This is what he is best at.
Gould and Sagan were two of the giants popularizing science when I was growing up. We will not see their like again, but we do see variations on a theme and that's good enough.