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

2) The development and adoption of renewable energy sources, such as solar and wind power, have contributed to the transition to cleaner and more sustainable energy systems, reducing reliance on fossil fuels and mitigating climate change impacts.

3) The word "chocolate" contains four vowels: O, O, A, and E.

4) The most-watched TV series finale in the United States was "MAS*H," with an estimated 105 million viewers.