Suddenly a strange smell appeared in the apartment. The husband, who had already visited the street this morning, explained this phenomenon: "At the entrance, the sludge was poured out." This put me in a deep stupor. I, of course, by profession is not a builder, but the crap was quite clear, and since childhood. They are camels. I think maybe it is like a solution – a liquid that changes its state. The husband, seeing my eyes for five copies, explained: “Well, bitumen was poured out. It is on top".