This question already has an answer here:
A mutual fund I have (Vanguard Health Care Inv - VGHCX) dropped around 8% in one day...which is kind of unusual for a fund. All the while the general stock market rose slightly.
Which brings me to my question... How do I research why it went down? What specifically caused it to do so.
I don't have any specialized tools other than Google/Yahoo/MSN finance sites...