How does one crack the world’s most famous code? The breakthroughs on Kryptos provide a guided tour through the cat and mouse ...

The 35-year-old saga of Kryptos, an enigmatic sculpture containing four encrypted messages outside the CIA headquarters, just ...

Find the area A of the circle above the rectangle and tangent to the small triangle.

The hour, minute and second hands of this clock are all the same length and move smoothly in a circle. The dial contains hour and minute markers, but the numbers are missing. Therefore, it’s ...

Brain teasers are excellent puzzle games for providing the brain with an effective mental workout. Math puzzles are a type of brain teaser that requires you to find the missing value. These types of ...

Brain teasers are excellent puzzle games for providing the brain with an effective mental workout. Math puzzles are a type of brain teaser that requires you to find the missing value. These types of ...

We all love a mathematical brainteaser here at IFLS. Monty Hall? Done it mate. Two circles shoved into a quadrilateral of unknown size? Been there, solved that. Some Singaporean kids’ seemingly ...

Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...

The company’s fiscal Q3 2025 results showed record quarterly sales of $94 billion, which is up 10% year over year, while its ...

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