Eureka moment

The exclamation 'Eureka!' is famously attributed to the ancient Greek scholar Archimedes. He reportedly proclaimed "Eureka!" when he stepped into a bath and noticed that the water level rose—he suddenly understood that the volume of water displaced must be equal to the volume of the part of his body he had submerged.  He is said to have been so eager to share his discovery that he leapt out of his bathtub and ran through the streets of Syracuse naked. Or so says Wikipedia. Photo taken with iPhone outside old UMIST building in Manchester.