Alan Yu

An alarming study on black plastic had a major math error. But it reveals bigger questions that have yet to be addressed.

Most counties in Pennsylvania don’t have their own health departments. A study shows that matters for residents.

The museum used storytelling to show kids how powerful their voices are.

Computer models helped decode whale communication. But some scientists say there are barriers that cannot be overcome.

Resident doctors from several major health care institutions in the region voted to form unions in the past two weeks.

Resident doctors at major Philadelphia-area hospitals voted whether to form unions.

The business has had a devoted local following for more than a decade.

Last year, one neighbor resorted to making signs that read, "Only a real jabroni would honk at the Miracle" and "Honking makes the baby Jesus cry."

This comes after a similar law went into effect in New York — the first in the country.

The Children’s Hospital of Philadelphia found nearly one in five patient families struggle to get enough food, and wanted to address it.

Eight years ago, construction workers discovered centuries-old human remains in Old City. Recently, descendants and researchers commemorated the reburial.

The bird flu virus continues to spread around the world, including in mammals like cows. Scientists are worried it could become a human virus.