1) The musical "The Phantom of the Opera" has been running in London's West End since 1986, making it the longest-running musical in history.

2) The study of fossils is called paleontology, and it helps us understand the history of life on Earth and the process of evolution.

3) The concept of virtual reality (VR) involves creating a simulated environment that can be explored and interacted with using specialized headsets and input devices.

4) The ocean covers about 71% of the Earth's surface and contains roughly 97% of the planet's water.