Explorer Richard Byrd's polar career began with an expedition based at Etah, on which large Danish-ruled island?

While living in the U.S., which scientist was offered the presidency of Israel in 1952? By tradition, no pope ever chooses which name? By weight, about 65 percent of the human body is which element? Which nomadic desert people of the Middle East are famed for breeding Arabian horses? Which British naval hero helped win the Battle of Cape St. Vincent in 1797? Byron was Lord Byron from age 10, but which poet had to wait until his 70s, in 1884, to become a lord? In "Childe Harold's Pilgrimage," Byron wrote "___, thou deep and dark blue Ocean, roll!" What are the missing words? Byron's 1814 ode to which fallen ruler says "Nor till thy fall could mortals guess / Ambition's less than littleness"?