Misc: In greek mythology, what is the alternate name for polydeuces?

Questions

Who composed the songs "The Old Folks at Home" and "Beautiful Dreamer"?

In which Royal residence did both George V and George VI die?

In which war did the battle of Sedan take place?

Who, in 1902, made the first million selling record?

In 1896 the speed limit for horseless carriages was raised from 4 mph to what?