Human life is full of realities. The simplest realities are known almost to all healthy people. The difficult ones are known to very few people. But, there are many realities in between the two that many people do not know about. In this book these realities are discussed one by one in a simple manner. In each volume of this book only one hundred realities are discussed. Each reality is explained under a separate number. Readers can read one or more items at a time and easily learn and remember it or them in future.