Every great invention finds its way to a book, to be read and learned by generations to come. These inventions have helped humanity in every possible way. However, the real wonder exists in the ideas which do not make headlines or referred by authors, yet they turn out to be extremely useful in their own unique way. Here are 16 clever, well-thought and useful inventions that you will never find in any book or manual. If you find any of these innovations useful or you wish to buy it, don’t forget to comment below.