1) The world's oldest known living tree is a bristlecone pine named "Methuselah" in California, estimated to be over 4,800 years old.

2) The recent advancements in space exploration include missions to Mars by various space agencies, such as NASA's Perseverance rover landing on Mars in 2021, aiming to explore the planet's geology and search for signs of past microbial life.

3) The eye of a cyclone is a region of calm, relatively clear skies and light winds at the center of the storm.

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