Challenge #17 Stumper: What is the linear measurement whose name is derived from a latin word meaning 'measuring rod' and that has been defined as being: one ten-millionth of the Earth's quadrant; 1,650,763.73 wavelengths of the orange-red light emitted by the radiocative isotope krypton-86; or, as the distance that light travels in a vacuum in 0.0000003 of a second? Answer: Meter (metre) Correct answer received from: Jane, Auriga, Lindy, Jason Coffer, J. Blickenstaff, Jim D.,