music: Category: 1970s Hits: The first of this band's 5 #1's was 1975's "Best Of My Love"?

Questions

This was the site of worse nuclear accident in history?

This word comes from a knight whose lance was free for hire, (i.e. Not pledged to one master).?

This word describes the nazi annihilation of Jews?

This word is used as the international radio distress call?

This world class model recently crashed in a helicopter?