1) The world's largest diamond, the Cullinan, was discovered in South Africa in 1905 and weighed over 3,000 carats.

2) 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.

3) The word "telephone" contains five vowels: E, E, O, E, and E.

4) The Southern Ocean surrounds Antarctica and is the coldest and least-visited ocean.