What's the Time

Is it even possible?!
To travel in time?
If you don't know how to explain to your kids, your friends or your students about what Time means, then in this book you will find the answers.
This book is for every age, anyone who can read and who is interested in what time is,will be the main audience.
It explains why people think time is relative, what is time, and gives the audience examples of different
devices to "measure" time, also it explains why time travel is not possible.
Definition: Time - is the logical or numerical expression, the result or comparison of standard process with defined one,used in the logical procedure to find out when defining process start, in which state it is right now and when it will ends.
Or, Time - is numerical or logical expression used in logical operation to find out when defining process start or started, in which state it is now or will be, when it was ended or when it will ends.