"Mais saviez vous que..."
I am a bit confused here.. why saviez and not savez? In English we often say "did you.." but that is a quirk and actually means "do you?" and it is heard as present tense. I see saviez as "did you use to know".. implying that you might have forgotten.. This is clearly an active question and I thought that French was more particular than that on its use of tenses.