Right back in February 1976, a 19 yrs old, Army recruit Pvt. David Lewis of Ashley Falls, Mass. complained to his drill sergeant that he felt very tired and weak but not sick. 24 hrs later, he was dead, killed by what health officials disclosed as "Swine Flu". Such deadly influenza was last seen in the "Great Plague" of 1918-19 which took almost 20 million lives worldwide. With that disaster in mind, everybody started considering "Swine Flu" as a big scare and epidemic. Apparently, no one could trace where the virus came from back then. Except for Pvt David Lewis, there were no other casualties however his few colleagues did catch the flu, still they remained unharmed. The virus and the story ended with that. Now guess what? "Swine Flu" is back again and it's bigger and better, so to speak. So what exactly is "Swine Flu"? Basically, when pigs get influenza or flu, it is said to be…