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

2) The first successful mass-produced personal computer, the IBM PC, was introduced in 1981 and played a significant role in popularizing the use of computers in homes and offices.

3) The world's longest traffic jam occurred in China in 2010 and lasted for 12 days, stretching over 60 miles (97 km).

4) The word "guitar" contains three vowels: U, A, and I.