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Fascinating. Did she work in medical / hard science? I could imagine some exposure to radiation / magnetization could do this.

Nope. Hotel, then airplanes.

Maybe using their watch hand to magnetize the hotel key cards?

I thought about it but their colleagues would have had the same problem, yet didn't. Plus becomming flight attendant removed that activity.

Not to mention it happened during the hollidays too.

It's probably more life style related, but I was there during said life style and couldn't figure it out.

Maybe some sort of magnet phone mount.