Misc: Which character in TV's Red Dwarf is obsessed with fashion?

Questions

robert heinlein: space vehicle named after famous italian scientist?

robert heinlein: character who conquered old age in time enough for love?

robert heinlein: editor of astounding sf to whom heinlein made his first sale?

robert heinlein: rah never owned a farm, but often used this pen name?

70s: this famous idaho dam went to pieces in 1976.?