Misc: In 1981 Voyager 2's closest approach to ---------- (63,000 miles/100,000 km). ?

Questions

Rene Laennec invented which aid to medicine in 1819?

Which rock musician committed suicide in Scattle on 5th April 1994?

Who wrote Principia Mathernatica. with Alfred North Whitehead, between 1910 and 1913?

What name is given to any muscle with three heads?

Which is the only Australian state capital that is not named after a person?