CANCER (June 21-July 22): In August 1961, East Germany's Communist government built the Berlin Wall, a thick concrete barrier made to keep East Berlin's oppressed citizens from escaping to freedom in West Berlin. The barrier was policed by armed guards. Traffic between the two Berlins was very difficult for the next 28 years. Then, a miracle: East German authorities relinquished their stranglehold, tentatively allowing East Berliners to travel to West Berlin. Soon the "Mauerspechte," or wall woodpeckers, showed up, armed with hammers and chisels, and began chipping away at the Wall. Two years later, most of it was demolished. I assign you to be your sphere's wall woodpecker. It's time to crush a barricade.