https://www.nobelprize.org/prizes/physics/1957/ceremony-speech/
Your Majesties, Your Royal Highnesses, Ladies and Gentlemen.
The Nobel Prize in Physics to Professor Tsung Dao Lee and Professor Chen Ning Yang for this year is concerned with some of the fundamental physical principles, the so-called parity laws – in the first place the symmetry of Nature with respect to right and left – in their application to elementary particles and their reactions.