Misc: In 1905 Jean-Rene ---------- France, tennis champ/alligator shirt designer, born. ?

Questions

what substance did joseph priestley name for its ability to erase pencil marks?

what does the term '30' mean to a newspaper editor?

what do huntsmen traditionally call out upon sighting a fox?

what british peerage gave its name to an overcoat, a sofa and a cigarette?

what is considered the sister language of english?