1) The European Union (EU) is a supranational organization comprising 27 member states that cooperate on various issues, including trade, economic integration, and common policies, while preserving individual national sovereignty.

2) The destructive power of cyclones is often attributed to their storm surge, which is a rise in sea level caused by the strong winds and low atmospheric pressure.

3) The development and adoption of renewable energy sources, such as solar and wind power, have contributed to the transition to cleaner and more sustainable energy systems, reducing reliance on fossil fuels and mitigating climate change impacts.

4) The first modern health insurance policy was introduced in Germany in the late 19th century.