Both should be changed regularly, and both for the same reason.
There's really no sure way to know.
None. That's a hardware problem.
One acts solely for money, the other is the actor.
When they get a hole-in-one they write down *zero* on the scorecard.
They both need to be changed after a while for the same reason
Because they're in continents.
Apricots. I used to love this joke when I was a little kid and told it over and over. I'm still a little in love with it for that reason. What are some of your favorite jokes from when you were a little kid?