1) The word "orange" contains three vowels: O, A, and E.

2) The world's oldest known recipe is for beer and is over 4,000 years old.

3) The concept of 3D printing, also known as additive manufacturing, was first introduced in the 1980s and has since revolutionized prototyping and small-scale production.

4) The word "oxygen" contains two vowels: O and E.