Nobody's mentioned the old classics I read in my youth:
--Hans Zinsser's Rats, Lice & History, which I think Guns, Germs & Steel is trying to imitate without giving due credit, unless I'm mistaking it for some other one,
--biologist René Dubos's The Mirage of Health,
--Watson's The Double Helix (a funny history of the discovery of the structure of DNA by its co-discoverer),
--1965 Nobel Prize winner Jacques Monod's Chance & Necessity,
--playwright Rob't. Ardrey's The Territorial Imperative,
--pioneering ethologist Konrad Lorenz's On Aggression,
--paleontologist G.G. Simpson's The Meaning of Evolution (and I'd like to read his sci-fi novel The Dechronization of Sam Magruder),
...and another classic is How To Lie With Statistics, which I'd like to read before I die and become a part of the statistics. As I said elsewhere, I'm younger than "owl" but not terribly younger, but at least I'm still not as forgetful (that bane of ripe old age) as venerable "owl".
Harlow Shapley's collection of essays titled Beyond the Observatory (1967) has been important for me because one of the essays inspired an int'l. space mission I've very recently suggested to the space agencies, but I don't think it deserves a discussion unless I get at least one reply, even if it's from the space agency of, for instance, humble Bangladesh, Malaysia, Vietnam, Peru or Algeria. The message was sent to 39 nat'l. space agencies or research organizations and seven int'l. organizations, including the U.N., in the course of a few days (Jan. 15-20).