Marie Curie visited Poland often, sometimes alone and sometimes with her family. During one of her visits, she set up the Polish Radium Institute for the research of radiation, a sister institute to the one that she had set up in France.
During the opening ceremony in 1932, she commemorated the event by planting a small sycamore tree next to the institute. At the time, people did not think much of it, but over the years the tree grew to be a respectable 62 feet (19 meters) high.
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