Kirk Johnson (born 1960) is an American scientist, author, curator, and museum administrator, and is currently serving as Director of Smithsonian's National Museum of Natural History. Dr. Johnson is the host of the PBS Nova series, "Making North America", which is a three-part series that describes the shaping of North America, which aired on November 4, 11 and 18, 2015.

Based on the paragraph above can we conclude that ""Making North America" was the most popular Nova series."?
It's impossible to say