Yes. That is certainly clear. No debate about that. This is true. But there's a huge difference between our work and their, largely speculative, work. A lot of the search engines, especially Google, won't share how their results are constructed. Because of this, they experiment and observe through a system that is changing all the time. Imagine trying to figure out how our world works if the physics that govern it kept changing, but you wouldn't be able to observe these changes on a grander scale until sometimes months later, if ever! I agree. Most of the info on the site is pretty useful. But I have trouble putting my trust about something entirely speculative coming from a single man. A man who, incidentally, also highly suggests some very questionable tactics to boost rankings in Yahoo! and Google.