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What scares them?
The first human has died from the H10N8 avian flu virus, which has only been detected in birds until now. Take a look at history's four main flu outbreaks.
The Spanish flu came on quickly. Some people felt fine in the morning but died by nightfall. People who caught the Spanish Flu but did not die from it often died from complications caused by bacteria, such as pneumonia.
It seems that residents of Louisiana are some of the happiest people in the country, and New Yorkers remain some of the unhappiest, according to a new report. Take a look at the happiest - and unhappiest - U.S. cities.