Measure by Hourglass

It's a test that will check your IQ.

Suppose you have one 11 minute hourglass and one 13 minute hourglass.

Can you measure exactly fifteen minutes using them ?




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What kind of storm is always in a rush?

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During which month do people sleep the least?

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Can you guess the riddle?

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How high do you have to count before you use the letter “a” in the English spelling of the whole number?

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There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.