History Lindstrom, Eleanor tribute Scientists African American women civil rights workers Astronomers Civil rights workers Race relations Shoshoni Indians Signers Statesmen Abolitionists African American women journalists African Americans Antislavery movements Archaeology Astronomy Burr-Hamilton Duel, Weehawken, N.J., 1804 Civil rights Concord, Battle of, Concord, Mass., 1775 Constitutional history Earthquakes Exploration Fugitive slaves Halloween Inventors Iroquois Indians Lexington, Battle of, Lexington, Mass., 1775 Life on other planets Lynching Oberlin-Wellington Rescue, 1858