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

2) The global push for COVID-19 vaccination campaigns has been a significant focus, with the development and distribution of vaccines to combat the spread of the virus and protect public health.

3) The ozone layer, located in the Earth's stratosphere, protects us from harmful ultraviolet (UV) radiation.

4) Many mountains have cultural and spiritual significance for local communities and are often considered sacred or revered in religious traditions.