SEATTLE — Troubling new signs of how the coronavirus is spreading in the United States emerged Friday, as cases not explained by overseas travel or contact with a person known to be infected were ...

NASA’s long record of watching Earth’s neighborhood has revealed countless surprises, but the agency has not confirmed any brand‑new, unexplained phenomenon near our planet in the current reporting.

Imagine suffering from strange symptoms for years—tremors, memory lapses, or unexplained pain—with no answers from doctors. For many, this is a frustrating reality. But stories of persistence and ...