After the deadly earthquake came the sinkholes… Yes, over 100 sinkholes have opened up in central Croatia after two earthquakes in December. Some holes have emerged under residential houses, forcing occupants to evacuate. A central Croatian region about 40 kilometers (25 miles) southwest of the capital, Zagreb, is pocked with round holes of all sizes, which appeared after December’s 6.4-magnitude quake that killed seven people and caused widespread destruction. Scientists have been flocking to Mecencani and other villages in the sparsely-inhabited region for observation and study. “These are so-called dropout sinkholes, and they appeared because of the specific geological composition...