Einstein formula E=mc2 on a grungy blackboard - stock illustration

A vector illustration of scientist Albert Einstein's equation, E is equal to mc square, E = mc2, energy mass equivalence. The equality or equal to sign is very artistically placed under an illuminated or lighted light bulb, as its screw element. The filament , rays, case, glass case, support wires are very clear hand drawn in white chalk over a textured gradient grunge lack background. The diagram is at the right side in the frame and copy space for text to the left. No people.