Rollercoaster in Mexico City derails, kills 2 and injures 2
                                
                                
                                    (Newser) -
                                    Two people were killed and two others wounded on Saturday when the last car on a rollercoaster in La Feria Chapultepec amusement park in Mexico City derailed, reports the  BBC . Witnesses say the car came loose, was dragged along at high speed, then fell from 33 feet halfway through the...