Abstract: I welcome you to the fourth issue of the IEEE Communications Surveys and Tutorials in 2021. This issue includes 23 papers covering different aspects of communication networks. In particular, ...

Sebastian Lopez Guardardo and Katherine Portilla greet customers at the grand opening of CoinFlip’s first-ever Crypto Center.

The Powerball jackpot hit $1 billion—the second biggest lottery prize of 2025 so far—after no tickets matched all six numbers drawn on Wednesday night, although the eventual winner will take home a ...