Misc: in the tv series 'happy days' what was arthur fonzarelli's nickname?

Questions

In Verdi's opera Rigoletto what is the occupation of Rigoletto?

Who was the Chief Designer of the Supermarine Spitfire?

In which country would you find the River Meander?

In which year was the infamous Salem witch trials held?

To which family of fishes does the Tuna belong?