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theory of a visit to our earth by unknown intelligences from the cosmos, we could postulate that today we are similarly constituted to those fabulous unidentified beings. In this chain of evidence, the offerings which the 'gods' asked our ancestors for raise curious problems. Their demands were by no means limited to incense and animal sacrifices. The lists of gifts required by the gods often include coins made of alloys which are specified in great detail. In fact, the biggest smelting installations in the ancient East were found at Ezeon Geber, consisting of a regular ultra-modern furnace with a system of air channels, chimney flues and openings for specific purposes. Smelting experts of our own day are confronted with the as yet unexplained phenomenon of how copper could have been refined in this prehistoric installation. That was undoubtedly the case for large deposits of copper sulphate were found in the caves and galleries around Ezeon Geber. All these finds are estimated to be at least 5,000 years old! If our own space travellers happen to meet primitive peoples on a planet one day, they too will presumably seem like 'sons of heaven’ or 'gods' to them. Perhaps our intelligences will be as far ahead of the inhabitants of these unknown and as yet unimagined regions as those fabulous apparitions from the universe were ahead of our primitive ancestors. But what a disappointment if time on this as yet unknown landing place had also been progressing and our astronauts were not greeted as 'gods', but laughed at as being living far behind the times!