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The Great Pyramid is the oldest and the largest of the three pyramids in the Giza Necropolis bordering what is now Cairo, Egypt in Africa. The only remaining member of the ancient Seven Wonders of the World, it is believed to have been constructed over a 20-year period concluding around 2560 B.C.E. as a tomb for the Fourth dynasty Egyptian pharaoh Khufu (Cheops).

In modern physics, the photon is the elementary particle responsible for electromagnetic phenomena. It is the carrier of electromagnetic radiation of all wavelengths, including gamma rays, X-rays, ultraviolet light, visible light, infrared light, microwaves, and radio waves. It can also be considered a mediator for any type of electromagnetic interactions, including magnetic fields and electrostatic repulsion between like charges.