There is one word that stands the test of time and holds fast to the center of everything. Though everyone will try at least once in their life to move around this word, but in fact, unknowingly, they use it every moment of the day. Young or old, awake or in sleep, human or animal, this word stands fast. It belongs to everyone, to all living things, but no one can master it. The word is?

Why this works

The riddle cleverly describes "gravity" through its various attributes and implications. First, "stands the test of time" suggests that gravity is a fundamental force that has existed since the beginning of the universe, and "holds fast to the center of everything" refers to how gravity pulls objects toward each other, especially massive ones like planets and stars. The phrase "everyone will try at least once to move around this word" highlights how people often attempt to overcome gravity (like jumping or flying), yet they are continuously influenced by it every moment, whether they realize it or not. Finally, the idea that "no one can master it" reflects the fact that, despite our understanding and technological advancements, gravity remains an unchangeable force that governs the motion of all living things.