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Bill O'Driscoll / 90.5 WESA

On today's program: DNA excavated from a nearby rockshelter could tell us about humanity 19,000 years ago; how the once-lost running buffalo clover has rebounded; why Pennsylvania is suing the family behind Purdue Pharma; and Pittsburgh ranks among the most sustainable for its building practices.

Flickr user Abby Lanes

Pittsburgh-based PPG industries announced to shareholders on Thursday that it will stop putting lead in any of its products by 2020.

The announcement came shortly after shareholder Perry Gottesfeld, public health activist and founder of the nonprofit Occupational Knowledge International, delivered a petition with more than 5,000 signatures asking the company to discontinue the use of lead.

“PPG is now the first large U.S. company to agree to completely reformulate their products and take out lead,” Gottesfeld said.

Sarah Schneider / 90.5 WESA

LGBTQI refugees and asylum seekers face additional challenges once they get to the United States. A panel of refugee experts, hosted by the Peduto administration’s Welcoming Pittsburgh initiative, addressed those issues Wednesday.

Beni Dedieu Luzau said for many refugees or asylum seekers, being LGBTQI means scrutiny and isolation from their own community, and in some communities could even mean death. He said they come to the U.S. for freedom, but then fear for survival if they come out.