Template:Are You Sure/December 13

• ... that physicist, mathematician, statistician, and meteorologist Akiva Yaglom contributed to statistical turbulence theory and random process theory?

• ... that Jonathan Wintersong is a Christmas comedy album by Jonathan Winters and Sarah McLachlan?

• ... that astronomer and philosopher Francesco Bianchini was secretary of the Papal commission for the reform of the calendar, working on the method to calculate the astronomically correct date for Easter in a given year?