21. A mother reads to her 6-year-old child through a basement window during a 1949 polio epidemic quarantine, LIFE Magazine, 3 October 1949.
22. Albert Einstein and his sister Maja, the 1890s.
23. Young Bosnian boy plays on the turret of a ruined tank following the Siege of Sarajevo.
Behind him, war-torn Grbavica neighborhood, Sarajevo, 1995.
24. Archaeological workers excavating plaster casts of victims of the eruption of Mt. Vesuvius in Pompeii, Italy, 1 May 1961.
25. Finnish Army Lieutenant Genera Harald Öhqvist and Colonel K. Yrjö Takkula, 1937.