02:41Watch the aftermath of the explosions that rocked Boylston Street during the Boston Marathon in the United States. Video by Steve Silva
01:54Follow up explosions Dar es Salaam
02:46On July 19, 1957, five men stood at Ground Zero of an atomic test that was being conducted at the Nevada Test Site. This was the test of a 2KT (kiloton) MB-1 nuclear air-to-air roc
