In today's Asking Eric column, R. Eric Thomas shares a reader response about how long you should keep greeting cards.

Do you have a stack of handwritten cards or notes that you keep because they are special to you? If so, you'll love this ...

Reconfigurable intelligent surfaces (RIS) have emerged as a promising technology for 6G networks. In this letter, we explore a novel use case for RIS: passive localization and tracking of a ...