Ebola
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How does a virus like this just come out of nowhere? It wasn't nowhere. There's been viruses in pigs, bats, monkeys, for thousands of years. But when you cut down their homes, and they die off, the monsters got to hide somewhere. It's the perfect killer. Isolation is the only thing that stops this thing spreading. The emergence of HIV, Ebola, and any number of hot agents, appears to be a natural consequence...of humanity encroaching on previously undisturbed environments. You might say the Earth's immune system has recognized the presence of its most destructive pathogen. humans. Some will leave us.But some will stay. Someone will always survive. That's why we are still here. Someone always survives. When they return, they're stronger than they were before. So we have to be more stronger and always make prepare for it.