No more guesses?  Ok, here is
the answer:
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DONATE BLOOD
When I worked as Medical Services Coordinator at a State institution where I worked for so many years, I was in charge of the employee annual blood drive.  I usually couldn't give blood, as I have pernicious anemia.  But one time I passed their finger stick test and tried.  Lasted half way through and about passed out and they stopped taking my blood.  Said I was turning green!  LOL  I felt very bad, since I was asking everyone else to give blood!  How about you?  Do you donate blood?