How small is a small-world network?

Discovered in the field of social sciences in the 1960s, the phenomenon known as small-world networks has fascinated popular culture and science for decades. It arose from the observation that in the world, any two people ...

Expert discusses the traffic impacts of Uber, Lyft

When John Zimmer took a city planning course in college, he had an epiphany: We've built our communities entirely around cars. As a result, we have more traffic and pollution and fewer green spaces, sidewalks and parks. Determined ...

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