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The Number of the Day: 100

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Gillette has created what they believe to be the world’s smallest advertisements. The ads – which measure less than 100 microns in size – were written onto actual male hairs using an electron microscope.

Related Fact: Later in life, razor mogul King Camp Gillette became a strong proponent of utopian socialism and planned a community in Arizona in which engineers would rationally orchestrate all activity. Gillette even offered Teddy Roosevelt $1 million to serve as president of this planned utopia in 1910, but Roosevelt declined.

[Sources: DVICE and Engineering ToolBox. 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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