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Bird flu is transmitted mainly by wild birds, like these snow geese in Ruthsberg, Md., in January 2023. Photo by JIM WATSON/AFP via Getty Images

As bird flu continues to spread in the US and worldwide, what’s the risk that it could start a human pandemic? 4 questions answered

Avian influenza viruses have evolved to infect birds, but the current H5N1 outbreak is also infecting a wide range of mammals. This suggests that it could mutate into forms that threaten humans.
A new federal regulation will set national limits on two ‘forever chemicals’ widely found in drinking water. Thanasis Zovoilis/moment via Getty Images

Regulating ‘forever chemicals’: 3 essential reads on PFAS

The Biden administration is finalizing the first federal limits on two compounds, PFOA and PFOS, in drinking water. These so-called ‘forever chemicals’ have been linked to numerous health effects.

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