Neil deGrasse Tyson evaluates photos of the "alien"
mummies that Mexico's government recently shared
with the world. Stick around for more with Neil
deGrasse Tyson, and check out his latest book, "To
Infinity and Beyond: A Journey of Cosmic Discovery"

Authors of the new book, "The History of Sketch
Comedy," Keegan-Michael Key & Elle Key put their
relationship to the test in this latest edition of The
Late Show's Pop Quiz! #Colbert #PopQuiz
#KeeganMichael Key #ElleKey