Hey guys, Chicago needs some blood. Chicagoist says:

From ABC 7 today, local blood banks have only a one day supply of Rh-negative blood in stock. A safe level would be considered a 5-7 day supply. Although all blood types are encouraged to donate blood, it goes without saying that type Rh negative blood (it can be used in transfusions for both Rh positive and negative patients) is of critical value to the banks right now.

You can schedule a time to donate blood by calling LifeSource at 1-877-543-3768.