Joel Songs: Only song for Christie Brinkley which mentions her first name?

Questions

what was the original surname of the british royal family before it was changed to windsor?

the bridge of sighs were usually crossed by __________?

at which meeting did allied leaders complete plans for the defeat for germany in ww2 and the foundation of the united nations?

which real island was daniel defoe's robinson cruesoe based on?

what does mark twain actually mean?