Why is the August 2017 eclipse such a big deal?

Why is the total eclipse of the sun on August 21, 2017 such a big deal? It has been 99 years since an eclipse passed across all of the United States like this one. Which means people around the country will only get to experience this incredible event once in a lifetime. This video features members of the Von Braun Astronomical Society in Huntsville, Alabama, talking about the solar eclipse and why you should make plans to see it.