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Dr. David Egilman, a physician and expert witness who, over a 35-year span, gave testimony in some 600 trials involving corporate malfeasance, resulting in billions of dollars in awards for victims and their survivors, died on April 2 at his home in Foxborough, Mass. He was 71.The cause was cardiac arrest, his son Alex said.Many medical experts make a side business in court, offering their informed opinions on the witness stand and helping to validate or undermine plaintiffs’ claims. But few make it a career-long passion in the way Dr. Egilman did. He taught at Brown University and ran a private practice but spent most of his time consulting and testifying in as many as 15 cases a year.He did more than just opine from the stand. A dogged researcher, he dug up incriminating emails and memos...

They’re in makeup, dental floss and menstrual products. They’re in nonstick pans and takeout food wrappers. Same with rain jackets and firefighting equipment, as well as pesticides and artificial turf on sports fields.They’re PFAS: a class of man-made chemicals called per- and polyfluoroalkyl substances. They are also called “forever chemicals” because the bonds in their chemical compounds are so strong they don’t break down for hundreds to thousands of years, if at all.They’re also in our water.A new study of more than 45,000 water samples around the world found that about 31 percent of groundwater samples tested that weren’t near any obvious source of contamination had PFAS levels considered harmful to human health by the Environmental Protection Agency. About 16 percent of surface water...