1) The global economy has experienced fluctuations and challenges, including the impact of the COVID-19 pandemic on businesses, supply chains, and employment, as well as efforts to address income inequality and promote sustainable economic growth.

2) The blue whale is the largest animal to have ever existed, with an average length of about 82 feet (25 meters).

3) The concept of gravity was famously described by Sir Isaac Newton after an apple fell on his head.

4) The musical "The Phantom of the Opera" has been running in London's West End since 1986, making it the longest-running musical in history.