How the U.S. and Mexico Are Fighting Deadly Flesh-Eating Screwworms

The American and Mexican governments are exploring “all options” to battle a deadly parasite threatening cattle and wildlife.

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Scientists are Learning to Rewrite the Code of Life

In a giant feat of genetic engineering, scientists have created bacteria that make proteins in a radically different way than all natural species do.

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William J. Rutter, Biotech Pioneer of Gene-Based Medicine, Dies at 97

His company, the Chiron Corporation, contributed important scientific discoveries toward treatments for H.I.V., hepatitis B, diabetes and more.

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E.P.A. Proposes Allowing Use of Dicamba Weedkiller on Some Crops

Last year, a federal court banned some uses of the herbicide, which can drift into fields and damage crops.

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Soaring Temperatures Threaten Crops, So Scientists Are Looking to Alter the Plants

Genetically altering crops may be key to helping them adapt to extreme temperatures. But shrinking funds and social acceptance stand in the way.

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Trump’s Billion-Dollar Tech Deals, and a Military Buildup at the Border

Plus, your Friday news quiz.

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Robert Shapiro, Who Made NutraSweet a Household Name, Dies at 86

His promotion of the sugar substitute was a success. But later, as head of Monsanto, he faced blowback after the company rushed into genetically altered products.

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Pig Kidney Removed From Alabama Woman After Organ Rejection

Towana Looney lived with the kidney longer than any other transplant patient had tolerated an organ from a genetically modified animal.

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For Patients Needing Transplants, Hope Arrives on Tiny Hooves

Some scientists are confident that organs from genetically modified pigs will one day be routinely transplanted into humans. But substantial ethical questions remain.

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Surgeons Transplant Engineered Pig Kidney Into Fourth Patient

A 66-year-old man from New Hampshire became the fourth person to receive a pig’s kidney.

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