Cryptograms replace digits with letters. Today's problem only involves three digits, but don't be fooled — it's not simple.
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There's a quick and easy way to measure gravity anywhere in the solar system.
Series 7 of 7
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A balanced scale stays balanced if we add or remove equal quantities from both sides. Can you solve this balance puzzle?
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By extending the sides of regular polygons, we can create interesting star patterns. What happens when we start shading them?
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When your car battery loses its charge, what is it actually running out of?
Series 4 of 4
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Using a formula isn't always the best way to calculate a probability. Instead, using areas of geometric figures can make things easier.
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Your twin took a trip through the stars and came back younger than you, but they think they should be older. Why are they wrong?
Series 3 of 3
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With only two containers of different sizes, you might be surprised at how many different amounts are possible to measure out.
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