Which man was both the 22nd and 24th president of the United States?

The presidential library at 210 Parkside Drive in West Branch, Iowa, honors which president, who was born in that town? Up to 2,160 people at a time could ride on which attraction at the 1893 Chicago World's Fair? Which naval officer was promoted to rear admiral 22 years after the famous mutiny against him on April 28, 1789? Which unit of weight equals about 2,204.62 pounds? Which author wrote 23 small books for children, including "The Tale of Tom Kitten"? In biological classification, which rank does the name "Homo sapiens" represent? 23 years after the United States did so, Brazil abolished what in 1888? About 23,000 casualties were suffered at the Civil War battle of Pittsburg Landing, also known by what name?