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Initial release
Who can give blood, today
Most donor lists are a page in a notebook. Names, numbers, groups. The trouble comes at the moment you actually need one, because the page cannot tell you the thing that matters: **most of the people on it gave recently and cannot give again yet.** Donor Grid turns that page into a board. The eight blood groups sit as eight fixed cells filling the screen — O−, O+, A−, A+, B−, B+, AB−, AB+ — and each cell shows how many of its donors are free right now. A group with someone available is solid. A group where everyone is still resting is drawn faded and hatched. A group nobody has registered for is left as an empty outline. One look and you know where you stand.