1) The world's largest particle accelerator, the Large Hadron Collider, is located near Geneva, Switzerland, and spans a circumference of 17 miles (27 kilometers).

2) The word "school" contains two vowels: O and O.

3) The Paralympic Games, held immediately after the Olympic Games, showcase the athletic abilities of individuals with disabilities and promote inclusivity in sports.

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