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Every year, nasal viruses and influenza spread all over the world, leaving hundreds of millions suffering from colds and coughing in their wake. Although she kills a number of people annually, there are much worse and more deadly viruses. The last outbreak of the Ebola virus killed thousands, and today we hear horrific news about the new Corona virus. Because of globalization, viruses can spread further and faster than ever. But are all viruses bad? Can they cause great harm to us? Can we reduce its dangers?