Pop Star Deaths: This Kiss drummer died of cancer in 1991.?

Questions

Who was the only president to serve two non-consecutive terms in office?

Whose presidential competency was questioned when he insisted during a debate that there was no Soviet domination in Poland?

Between 1857 & 1861, during James Buchanan's presidency, what role was performed by his neice, Harriet Lane?

Which ex-president died in 1973, five days before an agreement was signed in Paris ending the fighting in Vietnam?

What roars in the 'roaring forties?