1.  Which spiral arm of the Milky Way Galaxy contains our solar system?

2. Which is the correct phrase:  ‘to rack one’s brain’ or ‘to wrack one’s brain’?

3. What is a more common term for a Pasteur pipette?

4.  To what language group do Swahili, Xhosa and Zulu belong?

5.  On December 27, 1831, which noted scientist set sail for the Pacific Ocean from England?