A University of Pennsylvania researcher is leading an effort to connect photos taken of the Yazidi population in northern Iraq in the 1930s with descendants who lost much of their history in the 2014 Islamic State attacks

The Philadelphia Zoo is showing off 16 critically endangered western Santa Cruz tortoise hatchlings

Twin brothers who were born conjoined recently celebrated their first birthday after undergoing successful separation surgery

Philadelphia zoo officials say the recent, sudden deaths of all five of their meerkats were apparently caused by an accidental poisoning linked to a dye that is used to mark the animals

The city of Philadelphia issued an apology more than four decades after unethical medical experiments were allowed to be performed on mostly Black inmates at the city's since closed Holmesburg Prison from the 1950s to the 1970s

Authorities have announced an arrest in the stabbing death of a 19-year-old woman in Pennsylvania almost a half-century ago, crediting advances in DNA technology and genetic genealogical research

The administration of Democratic Gov. Tom Wolf is asking the state’s high court to weigh in on a legal battle over Pennsylvania’s plan to charge power plants for their emissions of planet-warming carbon dioxide

Pennsylvania’s Republican nominee for governor, Doug Mastriano, often makes the baseless allegation that Gov. Tom Wolf’s policy of readmitting COVID-19 patients from hospitals to nursing homes caused thousands of deaths

A proposal is advancing in the Pennsylvania Legislature to require the four state-related universities to promise they are not conducting research or experiments with fetal tissue from elective abortions