I really like Isaac Asimov's essays, at least most of the ones I have read. There are a huge number of them on many topics too: http://www.asimovonline.com/old

I really like Isaac Asimov's essays, at least most of the ones I have read. There are a huge number of them on many topics too: http://www.asimovonline.com/oldsite/essay_guide.html http://www.asimovonline.com/oldsite/essay_guide.html (A little searching and many/most of them are on someones website somewhere)