tv/ movies: Born Dec 25, 1899, He starred in this movie: Invisible Stripes - 1940?

Questions

Trivia : How is the mathematically related structure of beads strung on parallel wires in a rectangular frame better known?

Trivia : How is the stockmarket collapse of the 24th October 1929 better known?

Trivia : How many bits are in a nibble?

Trivia : How many countries have a population over 130 million ?

Trivia : How many countries have an area less then 10 square miles ?