- The Mysterious Stranger (Wikipedia)
The Mysterious Stranger is a novel attempted by the American author Mark Twain. He worked on it intermittently from 1897 through 1908. Twain wrote multiple versions of the story; each involves a supernatural character called “Satan” or “No. 44”. All the versions remained unfinished (with the exception of the last one, No. 44, the Mysterious Stranger).
- Gmail (Wikipedia)
Gmail is an email service provided by Google. As of 2019, it had 1.5 billion active users worldwide, making it the largest email service in the world. It also provides a webmail interface, accessible through a web browser, and is also accessible through the official mobile application. Google also supports the use of third-party email clients via the POP and IMAP protocols.