1) The unicorn is the national animal of Scotland.

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 Great Wall of China is not visible from space without aid, contrary to popular belief.

4) Orchids are one of the largest families of flowering plants, with over 25,000 species.