Science News Roundup: U.S. issues new warnings on 'forever chemicals' in drinking water; Ancient DNA solves mystery over the origin of medieval Black Death and more

Researchers on Wednesday said their observations offered insight into the interplay between the irresistible force of gravity that drives star formation and the huge amounts of energy that massive young stars inject into their nearby environments that could inhibit stellar birth.

Following is a summary of current science news briefs.

U.S. issues new warnings on 'forever chemicals' in drinking water

The U.S. Environmental Protection Agency on Wednesday released new warnings for synthetic pollutants in drinking water known as "forever chemicals" saying the toxins can still be harmful even at levels so low they are not detectable. The family of toxic chemicals known as per-and poly-fluoroalkyl substances, or PFAS, have been used for decades in household products such as non-stick cookware, stain- and water-resistant textiles, and in firefighting foam and industrial products.

Ancient DNA solves mystery over the origin of medieval Black Death

Ancient DNA from bubonic plague victims buried in cemeteries on the old Silk Road trade route in Central Asia has helped solve an enduring mystery, pinpointing an area in northern Kyrgyzstan as the launching point for the Black Death that killed tens of millions of people in the mid-14th century.

Researchers said on Wednesday they retrieved ancient DNA traces of the Yersinia pestis plague bacterium from the teeth of three women buried in a medieval Nestorian Christian community in the Chu Valley near Lake Issyk Kul in the foothills of the Tian Shan mountains who perished in 1338-1339. The earliest deaths documented elsewhere in the pandemic were in 1346.

In Tarantula Nebula, a stunning view of stars being born

Astronomers have peered into a teeming stellar nursery in the Tarantula Nebula - a colossal cloud of gas and dust next door to our galaxy - gaining new understanding of the dynamics of star formation while obtaining a dazzling image of the cosmos. Researchers on Wednesday said their observations offered insight into the interplay between the irresistible force of gravity that drives star formation and the huge amounts of energy that massive young stars inject into their nearby environments that could inhibit stellar birth.

(With inputs from agencies.)