It can't be known, because it would go something like this:
Crystal ball says you will die 6 months from now from getting hit by a bus while driving home from work. You don't drive that day, avoid the bus and you stay alive.
Crystal ball now says you will die in 12 years from a heart attack. You start eating better, exercise and you don't die in 12 years.
Crystal ball now says you die in 4 hours from brain damage due to wasting time on ATOT. You stop going on ATOT and read a book instead. You live.
Crystal ball now says you will die in 10 seconds from dropping crystal ball on foot, causing a blood clot to travel to your lungs, then your heart and you will die. You carefully go to set down the dangerous crystal ball and you slip, drop it and BAM you die. The end.
/thread
/thread
/thread
/dead