 
 <prompt> Wetin dey inside di properties of QED vacuum wey no dey exist physically? Based on di previous question, write one context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: ```QED vacuum get interestin and complex properties. For QED vacuum, di electric and magnetic fields get zero average values, but their variances no dey zero. As e dey so, QED vacuum dey contain vacuum fluctuations (virtual particles wey dey jump in and out of existence), and a finite energy wey dem call vacuum energy. Vacuum fluctuations na essential and common part of quantum field theory. Some experimentally verified effects of vacuum fluctuations include spontaneous emission and the Lamb shift. Coulomb's law and the electric potential for vacuum near an electric charge dey modified.``` 