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 Researchers may have discovered a mass grave for nearly five dozen 19th century Irish immigrants who died of cholera weeks after coming to Pennsylvania to build a railroad.Historians at Immaculata University have known for years about the 57 immigrants who died in August 1832, but could not find the actual grave. Human bones discovered last week near the suburban Philadelphia university may at last reveal their final resting place - and possibly allow researchers to identify the remains and rebury them.The woodsy site where the bones were found is known as  Duffy s Cut.  It is named after Philip Duffy, the man who hired the immigrants from Donegal, Tyrone and Derry to help build the Philadelphia and Columbia Railroad.The Irish workers were said to hav stanley cup e died of cholera, though researchers bel stanley usa ieve at least some may have been murdered. Prejudice against Irish Catholics contributed to the denial of care to the workers, historians say.The immigrants were buried anonymously in a ditch outside what is now Malvern. On Friday, researchers unearthed pieces of two skulls along with dozens of other bone fragments.        In June 2004, the state erected a historical marker in the general area of Duffy s Cut to comm stanley cup emorate the men s deaths. It says their illness and deaths typified the hazards faced by many 19th century immigrant industrial workers.Cholera is an acute intestinal infection caused by contaminated food or water. Outbreaks large and small were common at the time, when few peop Vygt io9 Newsstand: Best Stories of the Week for November 10   8211; 15
 The World Wildlife Fund is stanley cup quencher  sending Google-financed drones to African national parks to track down illegal poachers. But computer scientist Thomas Snitch believes he can do a better job鈥攂y applying a mathematical model he developed for the military to find insurgents making improvised explosive devices  IEDs  in Iraq.     According to an article in Defense One, Snitch   goal is to overcome poaching networks ; advantages in money and manpower. In South Africa   Kruger National Park, for instance, the park rangers make $150 per month protecting endangered animals such as the black rhino. Opposing them are networks of poachers who can sell one  stanley termosky rhino horn for $50,000 per kilogram on the black market. Snitch is skeptical of drones for several reasons. For starters, due to certain U.S. laws preventing the export of military-grade drones and State Department restrictions on the quality of the cameras they can use, any drones sent to Africa will be inefficient in surveying a place like Kruger National Park, which covers 7,850 square miles. And, even if a drone happens to spot a poacher, it won ;t be of an stanley spain y use unless park rangers are within striking distance. So, what could be learned from Snitch   experience with Iraq  We looked at every IED explosion over the last five years and pinpointed [the explosions] on the maps, Snitch explained to a group gathered at the University of Maryland in the spring of 2013. On top of that we overlaid