Good news, healthy and helpful Brokelynites! After a long closure due to one of the blizzards collapsing its roof last winter, the Brooklyn office of the New York Blood Center is reopening Sept. 8! So remember that post from last month where we told you all the sweet swag you get from being a blood donor, from Mets tickets to air hockey tables to racks of lamb? Now you don’t have to lug your big veins full of human juice all the way up to midtown to do it: the Brooklyn Donor Center is at 120 Lawrence St., near the Jay Street-Metrotech station. And if you make a donation before Sept. 30, you get 50 bonus points, which will put you well on the way to that new air hockey table.