10 Euros - Juan Carlos I Marie Curie

This coin is part of Spain's long-running "Grandes Mujeres de la Historia" commemorative program. Marie Curie's inclusion is straightforward on the merits — she remains the only person to have won Nobel Prizes in two separate scientific disciplines, Physics in 1903 and Chemistry in 1911, the centenary of the latter falling precisely in this coin's issue year.

The 1911 Nobel Chemistry Prize was itself awarded under controversy; the Swedish Academy had privately urged Curie not to attend the ceremony due to a concurrent scandal in the French press. She went anyway.