Two homemade pressure-cooker bombs exploded within seconds of each other near the finish line of the Boston Marathon on April 15, 2013, killing three people and seriously injuring hundreds. Some who escaped physical harm realized days or weeks later they were suffering from hearing problems, according to the Washington Post.

Harvard Medical School researchers studied the extent of the ear injuries suffered by Boston Marathon bombing victims and their findings have been published in the journal Otology & Neurotology.