So, I need a good source to refer them to: Either a book or a web site, that can summarize, for them, all of this information about general science.
Wowbagger,
I have some suggestions for you. I see that you live in the U.S., where many libraries use the Library of Congress classification system. You should have a good research library near you, so I recommend examining the Q 160's ("Science -- Popular Works"). I just did this and found several books that might be what you're looking for, but you know your audience much better than I do and might find something even better.
- How the World Works, by Boyce Rensberger (1986) I read much of this a few months ago. It's written in a clear, accessible style, and is one of those reference-like books that you can just spend an afternoon jumping around in. Kind of like the Web on paper. The first chapter is an introduction to the scientific method. Next are brief synopses of the twenty-four most significant scientific advances. The rest is a mini-encyclopedia of many scientific matters.
I haven't read the next few books, but they might be the kind of thing you're looking for.
- Science Matters, by Robert M. Hazen and James Trefil (1991) This looked interesting enough for me to check out of the library.
- Asimov's New Guide to Science, by some guy named "Asimov" (1984) This appears to be the last of four editions. But this is an Asimov, so it's 884 pages
(not counting the index and such). Your friends might find this intimidating, but it looks pretty comprehensive.
- The Physical Universe, by Konrad B. Krauskopf and Arthur Beiser (8th edition, 1997) This appears to be a textbook, probably college undergraduate level or maybe for advanced high school seniors. The first chapter is about the scientific method, then subsequent chapters follow a continuum through physics, chemistry, geosciences, and cosmology. Lots of color illustrations.
Are any of your friends interested in astronomy? One other book I'd recommend is
Astronomy: How Man Learned About the Universe, by Lou Williams Page (1969) This is rather out-of-date in some respects, but since it looks at the history of astronomy it's still functional. I enjoyed this book because it took a view of astronomical discoveries as processes. It shows that facts aren't just dropped into the heads of geniuses. Rather, it shows your Copernicus's and Einsteins encountering odd observations, and working through to the answers. It looks at how these people (and many other famous names) figured out how to figure things out.
While traipsing through the Q 160's, I also found some science popularizing books from the mid-nineteenth century. They are, of course, out of date, and perhaps for less advanced readers, but it's interesting how authors were creating "improving books" on technical matters that long ago.
- Peterson's Familiar Science, or the Scientific Explanation of Common Things, ed. by R.E. Peterson (1857). This is an odd book. It's just a series of nearly two-thousand questions and their answers. There are later editions, but the one from 1857 is available at Google Books.
- The Parlour Book, by William Martin. I couldn't find a year, but it looks early- to mid-19th C. It's for children. Nice illustrations, which the Google Books version does not do justice to.
- On the Improvement of Society by the Diffusion of Knowledge, by Thomas Dick, LL.D. (1833) There were later editions, as well. Dick appears to have been a minister and a science teacher who tried to accommodate these fields to each other. For example, compare Sections I and VI of this book, via Google Books. Interesting.
Can anyone suggest any good web sites?
For online material, various
Wikipedia Text
books are under construction, at varying degrees of completion. I don't know if or how they check the information, so YMMV.
http://en.wikibooks.org/wiki/Main_Page
Meanwhile, a more expert-driven alternative is
Citizendium, which is still in beta. They do already have a lot of material up, though.
http://en.citizendium.org/wiki/Welcome_to_Citizendium
Anyway, there's more than you wanted to know. But maybe it will get you pointed in the right direction.