Ukrainian mathematician, Maryna Viazovska, has become only the second woman to receive the prestigious Fields Medal.
Often regarded as the Nobel Prize for mathematics, she won for her work on a 400-year-old puzzle about sphere packing.
The other Fields medal winners were France's Hugo Duminil-Copin of the University of Geneva, Britain's James Maynard of Oxford University, and June Huh of Princeton in the United States.
The medal is awarded every four years to outstanding mathematicians under the age of 40.
The only previous female recipient of the Fields medal in its 86 year history was Iranian mathematician Maryam Mirzakhani, in 2014.