In late February, just weeks after Maryna Viazovska learned she had won a Fields Medal — the highest honor for a mathematician — Russian tanks and war planes began their assault on Ukraine, her homeland, and Kyiv, her hometown.
Viazovska no longer lived in Ukraine, but her family was still there. Her two sisters, a 9-year-old niece and an 8-year-old nephew set out for Switzerland, where Viazovska now lives. They first had to wait two days for the traffic to let up; even then the drive west was painfully slow. 
After spending several days in a stranger’s home, waiting their turn as war refugees, the four walked across the border one night into Slovakia, went on to Budapest with help from the Red Cross, then boarded a flight to Geneva. On March 4, they arrived in Lausanne, where they stayed with Viazovska, her husband, her 13-year-old son and her 2-year-old daughter.
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