1) In Norse mythology, the World Tree, known as Yggdrasil, is a massive ash tree that connects the nine realms of existence. It is considered the center of the cosmos and serves as a conduit between different realms, including Asgard (realm of the gods), Midgard (realm of humans), and Helheim (realm of the dead).

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

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

4) The word "telephone" contains five vowels: E, E, O, E, and E.