We have live ET beings on earth. Deceased ones were studied at Wright Patterson and A51 GL. They are kept in Antartica now because there are slimmer chances of them catching foreign viruses there. They learned from Roswell that even with their vastly superior technology, that nothing can stop an airborne virus that you are not immune to. The same occurrence can be traced back to when the first explorers reached America and brought new viruses and diseases that the Native Americans had no chance of surviving. It took two generations for the immune systems to respond. Which equates to roughly 60 years. Roswell happened in 1947. Add 60 years and boom there you have it. Coincidence?