manna

At www.thunderbolts.info/wp/2015/09/07/food-for-thought/ … there is a marvellous piece by Rens Van Der Sluijs on the food of the gods and the idea of people feeding from the sky. The notion of the edible sky, consisting of an oily substance that people could eat is a quite common theme of ancient mythology, he says, providing examples from Africa to Europe and the Americas etc. How far back does the idea go? Has it got anything to do with the electric universe theory?