Emma Bowman | Michigan Radio
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Emma Bowman

Editor's note: This story contains language that some listeners may find offensive.

To siblings Flip and Christine Cuddy, Susan Ahn Cuddy was "Mom."

But she was also a Korean American lieutenant in the U.S. Navy who trained pilots to shoot down enemies during World War II.

It wasn't until historian John Cha's biography of Susan was published in 2002 that her children learned about many of their mother's accomplishments.

The growing popularity of FaceApp — a photo filter app that delights smartphone users with its ability to transform the features of any face, like tacking on years of wrinkles — has prompted Democratic Sen. Chuck Schumer to call for a federal investigation into the Russia-based company over what he says are potential national security and privacy risks to millions of Americans.