Judy Woodruff:

It has been quite a year in the world of science. The headlines and images were powerful, among them, the rupture of enormous icebergs, scientists taking to the streets, the solar eclipse that captured the attention of the country, and new insights into the workings of the universe.

William Brangham sat down with Miles O'Brien to get some perspective on it all.

It's part of our weekly segment, the Leading Edge.