Which of the inventions listed below do you consider the most important for mankind? Write a short paragraph to explain why. discovering how to make fire

I think that the most important invention was the invention of mobile phone.
Before the invention of the cell phone people went about their daily lives in a constant state of questioning - even if they didn't realize they were doing so. When a friend or family member went on vacation they wondered if the trip was made safely. When a child left for college parents wondered if they made it without car trouble. It is doubtful that people even realized they were always in a state of questioning.
The mobile phone changed all of the questioning. Now, mothers could call and find out if their children made it to their destination without any mishaps. Husbands could tell their wives when they were running late.
If they weren't wondering about someone's whereabouts they were wishing they had remembered to tell them something before they were away from their office or home phone. Perhaps it was to stop and pick up the kids or to go by the bank because they loan officer called. Whatever the reason, before the invention of the cell phone, they would have to wait to see them and then send them back out to take care of the issue.
Mobile phones have made keeping in touch across long distances easier than ever before. For the most part, the cost of calling across long distances is much less expensive using mobile phones than it is using land lines. Many cell phone plans have free long distance.