<Li> Mach--Zehnder </Li> <Ul> <Li> Quantum eraser (delayed - choice) </Li> </Ul> <Li> Quantum eraser (delayed - choice) </Li> <Ul> <Li> Schrödinger's cat </Li> <Li> Stern--Gerlach </Li> <Li> Wheeler's delayed - choice </Li> </Ul>

Who discovered light is a particle and wave