Knowledge of human loss from 1900 to 2000

This is knowledge of huge losses of human life between 1900 to 2000. This book is written not to glorify death but to learn from it. If one day time travel becomes reality maybe someone could stop some of these losses of life. One could dream of this being a different version of a sports almanac. May it be one to reverse the loss of life. For us morals without time machines we are to learn from our mistakes.