Which component of the blood is abbreviated Hb?

A complaint by Newt Gingrich about outside income led to which House Speaker's 1989 resignation? In a medical chart, a complaint of SOB means shortness of what? Which often-sung song was originally titled "Good Morning to All" in 1893? Which gas, discovered in 1774, got its name from the Greek words for "acid-forming"? Which Baroque composer's initials were J.S.B.? Which composer, who died in 1827, reportedly said on his deathbed, "I shall hear in heaven"? A compromise allowed Maine's admission to the Union in 1820 as a free state and which state in 1821 as a slave state? Which is the oldest campus of the University of California?