
Why does time appear to run in only one direction? We remember the past- but why not the future? We can influence the future- but could we, even theoretically, influence the past? Generations of philosophers and theologians, physicists and mathematicians have puzzles and speculated...

Why does time appear to run in only one direction? We remember the past -- but why not the future? We can influence the future -- but could we, even theoretically, influence the past?