1) The Amazon rainforest produces more than 20% of the world's oxygen.

2) The first photograph of a black hole was captured in 2019 using a network of telescopes around the world.

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

4) The word "pencil" contains two vowels: E and I.