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Bad news travels fast—when you watch the evening news or read the morning papers, it seems that things that get the most coverage are all tragedies like wars, earthquakes, floods, fires and murders.

This is the classic rule for mass media. “They want your eyeballs and don’t care how you’ re feeling, ”Jonah Berger, a psychologist at the University of Pennsylvania, the US, told The New York Times.

But with social media getting increasingly popular, information is now being spread in different ways, and researchers are discovering new rules - good news can actually spread faster and farther than disasters and other sad stories.

Berger and his colleague Katherine Milkman looked at thousands of articles on The New York Times’ website and analyzed the “most e-mailed” list for six months.

One of his findings was that articles in the science section were much more likely to make the list. Those stories aroused feelings of awe and made the readers want to share this positive emotion with others.

Besides science stories, readers were also found to be likely to share articles that were exciting or funny. “The more positive an article, the more likely it was to be shared, ”Berger wrote in his new book, Contagious: Why Things Catch On. For example, “stories about newcomers falling in love with New York City”, he writes, tend to be shared more than “the death of a popular zookeeper”.