That's ok until Google infects a current search with a previous search as it seemed to do for me the other day. In some cases that might help, and although they

That's ok until Google infects a current search with a previous search as it seemed to do for me the other day. In some cases that might help, and although they were in the same domain I was actually looking for something else. Maybe it was an accident, but the result (at position 3 or 4) looked very much like it'd been boosted from my search a minute earlier. Anyone else experience this?