Search engine usually have their own database of sites they craw and list in their database, for example Google, Yahoo, Ask. Meta Search Engines usually do not have their own database of crawled...
Rotaries have gotten better, but that's it. A piston engine is far superior. It has much more tuning available to it and makes more power and torque. Also they are more reliable and more durable,...
I think different searcher are good for different queries. For example for searching different downloads usual searcher are not very good and you need to use specific sites. If you are looking for...