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Fidget spinners, the palm-sized toys that have taken over classrooms and offices across the world, are still increasingly popular. The toy is so popular that different versions of the toy currently make up all of Amazon’s top 20 best sellers for toys and games, according to Time. Their price ranges from $2 all the way to $1,000. Spinners are a simple mechanical gadget with a bearing in the middle that allows it to spin.

Here’s what you need to know about the popular toy:

1.The Inventor of the Fidget Spinner Isn’t Making Any Money From Her Invention

The fidget spinner was invented by Catherine Hettinger. (Getty Images

The invention of the fidget spinner is often credited to a woman named Catherine Hettinger. Her patent for the toy was approved in 1997. According to The Guardian, Hettinger was unable to afford the patent renewal fee of $400 in 2005.

Hettinger told The Guardian she invented the fidget spinner during the 1990s, during a time when she was suffering from an autoimmune disorder called myasthenia gravis. Myashtenia gravis causes muscle weakness, which made playing with her young daughter difficult.

2. Videos of People Doing Fidget Spinner Tricks Have Millions of Views

Many videos of people performing and explaining fidget spinner tricks have sprung up on YouTube. Videos show tricks of varying difficulties from beginner to expert. Some of the videos make fun of the fad. Many videos involve people using air compressors to make the fidget spinner spin faster than a human could make it spin.

3. Experts Have Recently Said Spinners Do Not Help With ADHD and Autism

Some fidget spinner companies market the spinner as a “miracle” toy that can help aid people dealing with post-traumatic stress and other disorders. The popular belief that these toys can help with disorders such as autism, PTSD and ADHD, has recently been shot down by several experts.

Show more about Fidget Circle.