What unusual pet does Rachel buy in Season 5?

A hairless cat

Which Psalm famously begins "The heavens declare the glory of God"? Who is considered the greatest chess player ever by many and held the World Championship title from 1985 to 2000? Which historic agreement in 1215 was aimed at establishing the privileges of the English barons? What human enzyme breaks down proteins in the stomach? Which famous clock tower is located at the British Parliament buildings?