1) The assassination of Archduke Franz Ferdinand of Austria in 1914 triggered the start of World War I.

2) The eye of a cyclone is a region of calm, relatively clear skies and light winds at the center of the storm.

3) The COVID-19 pandemic has highlighted the importance of global collaboration and solidarity in addressing public health emergencies, with efforts focused on vaccine sharing, equitable distribution, and support for developing countries.

4) The Dow Jones Industrial Average (DJIA) is a stock market index that tracks the performance of 30 large, publicly owned companies in the United States.