Marie Skłodowska-Curie received the Physics Prize in 1903
for the discovery of radioactivity and the Chemistry Prize in 1911
for the isolation of pure Radium, making her the only person
to win a Nobel Prize in two different sciences.

It was difficult to pay tribute to a specific woman as there have been so many famous ones throughout history. Besides it was even more difficult to figure a concept out of any given choice. Maybe was I too much looking for a famous woman... instead of looking for the most famous person, period.

Radioactive decay is the key for accurate measurement of matter evolution. Prior to its discovery, the universe chronology was in embryonic stages. Marie Curie truly was the mother of modern science.

The "hourglass" symbol is not obvious. It represents this idea of dating using radioactivity, with a pair forming the shape of "88", the atomic number of Radium, a silvery white metal.