“Dogfight Over Guadalcanal” examines the showdown between 30-year-old Southerland in his Wildcat, and Saburo Sakai, 25, in his Mitsubishi Zero. Watch the full episode online.

In 1918, a flu pandemic ripped through the global population with such speed and virulence that by the end of the following year an estimated 40 million people would be dead — four times the number of victims eventually claimed …