Template:Are You Sure/November 4
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• ... that physician, mathematician, and physicist Rasmus Bartholin (13 August 1625 – 4 November 1698) discovered the double refraction of a light ray by Iceland spar, publishing an accurate description of the phenomenon in 1669?
• ... that physicist Norman Foster Ramsey Jr. (27 August 1915 – 4 November 2011) was awarded the 1989 Nobel Prize in Physics for the invention of the separated oscillatory field method, which has important applications in the construction of atomic clocks?
• ... that priest and mathematician Jean-Charles della Faille (1 March 1597 — 4 November 1652) published a method for calculating the center of gravity of the sector of a circle?