If anyone knows the name of this old movie please let me know.
All I can remember that the man is working hard and on overtime in his "lab"?
His friend tells him he has to take it easy.
The guy ends up going back in time and falls in love with a woman who ends up dying. He comes back in time and flies out of the house to run to her grave.
In the meantime his friend comes to the house at the same time
to introduce him to his sister. He ignores them and runs to the grave which is not far from his house. While crying over her grave he hears a voice ask him what was she like. He turns around to see his friend's sister who looks exactly like the woman from the past.