Template:Are You Sure/December 25

• ... that Italian physician Filippo Mazzei befriended Thomas Jefferson, and the two men started what became the first commercial vineyard in the Commonwealth of Virginia?
• ... that Enrico Fermi's computation of Santa Claus' flight path unexpectedly revealed a new Gnomon algorithm function which computes the brightness of Rudolph the Reindeer's red nose?
• ... that astronomer Vera Rubin's pioneering work on galaxy rotation rates was initially met with skepticism but was confirmed over subsequent decades?