When he was only a six-year-old boy, an explosion all but destroyed his hands. Though his left thumb could not be saved, after hours of painful surgery, his fingers were reattached.

You can say good-bye to pesky thumb arthritis from overtexting. Now all you have to do is think a thought with this specific person in mind and that thought will be instantly sent to their phone.

In the previous figure we appended a general rule of thumb below each category, but after reading this article, it will all be apparent to you.