In 1751, Axel Cronstedt discovered which element in a mineral?

1,728 cubic inches equal how many cubic feet? Which Founding Father lived from 1732 to 1799? The year 1732 saw the birth of George Washington and the first issue of which almanac? Which 1742 oratorio features the choruses "And He Shall Purify" and "Surely He Hath Borne Our Griefs"? Benjamin Franklin's 1751 book "Experiments and Observations on" what helped make his name in Europe? In 1757, which Prussian king decisively defeated a combined Austrian and French army at Rossbach? In 1758, after about 25 years, Benjamin Franklin wrote the last edition of which almanac? Dr. Pangloss is the naive tutor of which title character in a 1759 Voltaire satire?