Colombia dealing with aftermath of devastating flooding, blames hard rain
                                
                                
                                    (Newser) -
                                    A grim search for the missing resumed at dawn Sunday in southern Colombia after  surging rivers sent an avalanche of floodwaters, mud, and debris  through Mocoa, killing at least 200 people. People pried through piles of rocks and wooden planks that entombed homes. Streets were covered in thick sand, mud,...