1) The concept of political parties allows for organized groups to mobilize support, articulate policy positions, and compete for political power through elections and political campaigns.

2) The Eiffel Tower can be 15 cm taller during the summer due to thermal expansion.

3) The word "forest" contains two vowels: O and E.

4) As of 2023, the COVID-19 pandemic continues to impact countries worldwide, with efforts focused on vaccination campaigns, public health measures, and economic recovery.