There When You Need It

When I donated blood some time ago, a nurse gave me a card to read while a pint of the vital red fluid was flowing out of my vein. The card showed the percentages of people who have different blood types. Here are some of them:
O-Positive 37.4%
A-Positive 35.7%
A-Negative 6.3%
B-Negative 1.5%
The rarest, AB-Negative, is in only 1 in 167 people, or 0.6% of the population. Then the card made this eye-catching statement: “The rarest blood type is the one that’s not there when you need it.”

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