Discover how the Luhn Algorithm verifies credit card accuracy, supports secure transactions, and helps prevent errors in inputting Social Security numbers.

The original version of this story appeared in Quanta Magazine. If you want to solve a tricky problem, it often helps to get organized. You might, for example, break the problem into pieces and tackle ...

“Being trapped on that mountain gave me a chance to see what I would regret if I died,” said journalist Alec Luhn Alexander Zemlianichenko/AP; Sergei Gapon/Anadolu Agency via Getty Alec Luhn was ...

(CNN) — As he tumbled down a steep cliff in Norway, Alec Luhn knew his life was in danger. “I remember thinking, ‘This is really bad. This is the start of the disaster movie,’” Luhn said in an ...

Alec Luhn, the journalist from Wisconsin who spent six days stranded on a remote Norway mountain before being rescued, said his family gave him the hope and will to survive. "Just thinking about my ...

Luhn was reported missing on Aug. 4 after failing to board a scheduled flight. Alec Luhn, a 38-year-old journalist who has worked for The Guardian, The New York Times and The Atlantic, is speaking out ...

Alec Luhn, 38, an American journalist, hopes the lessons he learned from his ordeal in a national park in Norway can help others. By Claire Moses Almost everything had gone wrong on Alec Luhn’s solo ...

NEW YORK -- Alec Luhn, a 38-year-old journalist who has worked for The Guardian, The New York Times and The Atlantic, is speaking out for the first time since his dramatic rescue in Norway. "I was ...