你如何找到免费的学术/科学资料？
多年来，文案写作、搜索引擎优化等因素使得在互联网上找到优质资料变得越来越困难。寻找所需信息的努力也越来越大。
当我需要学习一个新主题时，通常会搜索科学文章。几年前，我发现通过搜索“关键词 PDF”往往能获得不错的结果，因为这会引导我找到不易更改的静态PDF文件。这些文件通常是由学术界人士撰写或由政府机构制作的。
然而，最近我感觉搜索结果越来越多地指向一些“僵尸网站”，这些网站只是重定向到广告和其他垃圾内容。
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Over the years, copywriting, SEO, and other factors have made it increasingly difficult to find quality material on the internet. It takes more and more effort to find what you're looking for.<p>When I need to learn about a new topic, I usually search for scientific articles. A few years ago, I discovered that I often got good results by searching for "KEYWORD PDF," as this led to static PDF files that aren't easily changed. Very often, they are written by academics or produced by government agencies.<p>Lately, however, I've gotten the feeling that the results more and more often lead to "zombie sites" that just redirect to ads and other junk.