
Clear Skies’ data analysis shows that peer-review rejects papers where we flag concerns. When I buy something with a credit card, I tap my card on a card reader to make a payment. It’s very convenient. Every now and then, I might go into a shop where I’ve never been before. Then, when I tap my card, I am asked to enter my Personal Identification Number (PIN) to verify that I am me. Why does this happen?