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First of all, let's take a look at the meaning of "to fidget".
The next question that arises is "but, why would you buy a $15 fidget spinner when you already have a pen?" I wouldn't, but it's flashy, it can have lights, it makes an interesting noise when it spins, and it's everything that the kids like which should be enough of an answer.
However, a fidget spinner isn't necessarily a waste of money. It reportedly offers some benefits when it comes to relieving and easing stress, PTSD, anxiety and ADHD.
1) Fidgeting occupies the parts of your brain that are usually taken over with random thoughts that are cause by boredom such as existential questions, worrying, etc.2) It is already known that physical activity helps with thinking, for example, writing helps with remembering. In the same manner, fidget spinner could help with thinking.3) It becomes a ritual. Rituals offer comforting predictability, familiarity and structure. They could have calming effects.
However, don't get ahead of yourself just yet, since these benefits only have limited concrete scientific evidence. Until they have been researched, we can only discuss. What do you think? Could fidget spinners really provide these benefits? Do you own one?