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The Number of the Day: 23:59:60

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A "leap second" is a single second of time which is sometimes added into the Coordinated Universal Time in order to make it more accurately sync up with astronomical time. Leap seconds are added on an as-needed basis, and are typically tacked on as the 61st second of the last minute of June or December. The time of these additional seconds are notated as 23:59:60.

Related Fact: The most recent leap second was added on December 31, 2008. So, if that felt like a long year, now you know why.

[Source: Time and Date. See previous Numbers of the Day here.]

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This Puzzling Math Brain Teaser Has a Simple Solution
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Fans of number-based brainteasers might find themselves pleasantly stumped by the following question, posed by TED-Ed’s Alex Gendler: Which sequence of integers comes next?

1, 11, 21, 1211, 111221, ?

Mathematicians may recognize this pattern as a specific type of number sequence—called a “look-and-say sequence"—that yields a distinct pattern. As for those who aren't number enthusiasts, they should try reading the numbers they see aloud (so that 1 becomes "one one," 11 is "two ones," 21 is "one two, one one,” and so on) to figure the answer.

Still can’t crack the code? Learn the surprisingly simple secret to solving the sequence by watching the video below.

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What Number Is The Answer?
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