A weathered sign in the Minnesota River Valley proudly proclaims: “World’s Oldest Rock.” Erected in 1975, it marks a 3.8-billion-year-old gneiss — or so scientists thought.

A ridge over southern WA will persist for the remainder of the week, with a broad trough forming near the west coast on the weekend. Southeasterly 10 to 15 knots, reaching up to 20 knots offshore in ...

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