What do you think you will have done by the time you reach retirement age?
How many languages do you think you will have learned by the time you turn 80?
By the end of this semester, how many books do you think you will have read?
By the time space tourism becomes affordable for the average person, how many people do you think will have traveled to space?
How many movies do you think you will have watched by the end of the year?
By the time you retire, how many innovations in technology do you think will have transformed the way we live and work?
How many advancements in medical technology do you think will have been made by the end of the century?
By the end of this decade, how much progress do you think humanity will have made in space exploration?
By the end of this year, what do you think you will have done?
By the time you retire, how many countries do you think you will have visited?