Wilber Rafael Garces Perez was being held Tuesday at a federal center in South Texas.

A woman who witnessed the in-custody death in Georgetown last Saturday said four officers were on top of Keenan Pearson, he stopped responding, and appeared to be dead by the time aid arrived.

The incident raises the possibility that top secret weapons technology may have been exposed to a foreign adversary — including China.

Political science professor Justin Grimmer’s research offers a detailed look at election fraud claims, their purveyors, and the election skeptics who believe

In a new report, the A.I. start-up added that it could not determine if the research was legitimate or nefarious, leading the company to shut down the work.

There have been several promising developments lately in cancer research and treatment, including a new drug approved by the FDA this week for advanced pancreatic cancer. William Brangham reports.

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