tv/ movies: Born Dec 25, 1899, He starred in this movie: Two Against the World - 1936?

Questions

how many white keys are there on a standard piano?

what os was originally called dr-dos?

where does most of the worlds oxygen originate from?

where is the statutory inscription, 'he's ain't heavy, he's my brother' (format - city, state)?

what city did the atlanta braves transfer from for the 1966 season?