According to Neil deGrasse Tyson, three fears account for "the most expensive, ambitious projects humans have ever undertaken."

In the video below, Tyson says going into space would "transform society, change the zeitgeist of your culture, turn everyone into people who embrace and value science, technology, engineering and math, the STEM field."

The video is part of our series of the most popular videos of Summer 2013.

Watch here:

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