What would cause a yahoo search engine to produce different results for the same search criteria?

I was in the library with some friends and we were doing some research for some term papers. We all place in the same search criteria into the yahoo search engine and out of the 6 of us only 2 got the same exact search results (after a couple of tries). What would cause this type of anomaly to happen?
Okay, the same, exact identical criteria, entered in the same time fram of 3 seconds, using pcs that are running windows xp. The destination site has not changed and is accessible by the administrators computer, is a regularly used site that can be viewed by any age group (safe).
Okay, the same, exact identical criteria, entered in the same time fram of 3 seconds, using pcs that are running windows xp. The destination site has not changed and is accessible by the administrators computer, is a regularly used site that can be viewed by any age group (safe).

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Yahoo Search Suggest Closeup


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See Search Suggestions On Steroids: Yahoo Search Help. Feel free to use this image. Just link to the photo page or tale.

When I type in something in yahoo search engine, the next time I type something similar, it comes as a previous search below or when the box is empty and I press the down arrow the previous searches appear. I am currently sharing a computer with someone and i wouldn’t like him to know my searches. Is there a way to do so?

Answer by Atheist Slayer
When you press on the down arrow (Yahoo search box) it will drop down a menu. On the right is the On/Off option, click off. It is known as Search Suggestion.
You can always turn it back on when your done.

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