President Trump wants to bring pharmaceutical manufacturing back to the United States. Experts warn that tariffs could result in shortages and higher prices for generic drugs.
The F.D.A. approved an artificial vessel to restore blood flow in patients, despite its own scientists flagging questionable study results and potentially fatal ruptures of the product.
Some scientists are confident that organs from genetically modified pigs will one day be routinely transplanted into humans. But substantial ethical questions remain.