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Aleksandar Mitrović Čame

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MATH PUZZLE: Can you replace the question mark with a number?

Metre

In 1983, the fifth legal definition of the metre was the the distance that light travels in a vacuum in 1/299,792,458 of a second. length of the meter was redefined at the 17th meeting of the international body Conférence Générale des Poids et Mesures (GCPM) by a method to give greater accuracy. It superceded the fourth legal definition adopted on 14 Oct 1960 based on a spectral line of kryton. Earlier definitions included the distance between marks on the international prototype metre bar made of platinum-iridium alloy (28 Sep 1889). Before that, the metre was decided that it should be one ten-millionth of the distance from the North Pole to the equator (1 Aug 1793), and the earliest concept was the length of a pendulum with a half-period of one second (8 May 1790).«

Invisible man

Nurse: "The invisible man is here for his appointment."
Doctor: "Tell him I'm sorry I can't see him right now."
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