It may be good if man can control the timing by a time machine.We can adjust the day long or short,day or night .Students car have more time to Study before the examination.They can get nigh marks.We can spend more time to have entertainment. Time machine and we can visit our ansector we can understand all the history of the man.I think is a great,good and very good time journey BYE! BYE! I feel about that!