1) Elvis Presley, often referred to as the "King of Rock and Roll," has sold over one billion records worldwide.

2) The ongoing conflict in Syria, which began in 2011, has resulted in a humanitarian crisis, displacement of millions of people, and international efforts to bring about a resolution and provide aid to those affected.

3) The world's first credit card was introduced in 1950 by Diners Club.

4) The development of the World Wide Web Consortium (W3C) and web standards has ensured interoperability and compatibility across different web browsers and devices.