Template:Are You Sure/January 19

• ... that chemist and physicist Henri Victor Regnault studied the thermal properties of matter; that he designed sensitive thermometers, hygrometers, hypsometers and calorimeters, and measured the specific heats of many substances and the coefficient of thermal expansion of gases; and that in the course of this work, he discovered that not all gases expand equally when heated and that Boyle's Law is only an approximation, especially at temperatures near a substance's boiling point?

• ... that Dee Ring, the home-repair superspy played by Patrick McGoohan in the television series D-Ring: Agent of Suspense, also appears in a crossover episode of Secret Reagent Man starring McGoohan and Johnny Rivers?

• ... that astronomer Jacobus Kapteyn studied the proper motions of stars, reporting in 1904 that these were not random, as it was believed in that time; stars could be divided into two streams, moving in nearly opposite directions; and that it was later realized that Kapteyn's data had been the first evidence of the rotation of our Galaxy, which ultimately led to the finding of galactic rotation by Bertil Lindblad and Jan Oort?

• ... that The Man From K.E.S.S.E.L. is an American science fiction buddy television series about a pair of space pilots (Robert Vaughn and David McCallum) who work for K.E.S.S.E.L., a secret interplanetary smuggling ring?