Finding the Time

The original incarnation of today’s puzzle talked about winding a clock but who even knows what that means anymore? Here’s a more modern formulation. While you’re asleep one night, there’s a power outage…

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Numerical Phrases

I was in sixth grade when I first saw this puzzle and it captivated me for a few days, because I have no problem wasting ridiculous amounts of time on useless activities (like this blog).

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One of the nice things about living in Seattle is that on clear days we get a great view of Mt. Rainier. Considered an active volcano, Mt. Rainier is the third-highest mountain in the lower 48 states at 14,411 feet, and the most ice-covered, with 25 major glaciers covering 34 square miles (source).

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Card Detective

You and two of your friends (not facebook friends, real world friends, remember those?) are playing a game. The dealer holds three cards, which may contain any number of aces (0, 1, 2 or 3). Each player is dealt a card face down, and asked to hold their card up against their forehead so the value side is facing out.

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Measuring Mystery

This is another one that Microsoft and other companies have used as an interview question but it’s a little easier than some of my recent brain benders.

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Pink or Blue?

For the past 63 years in a row, babies born in the US have been slightly more likely to be a boy than a girl, at a rate of roughly 51% to 49% (source).

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Three co-workers are on a business trip. They arrive at their hotel only to learn their reservations have been lost. The desk clerk tells them there is only one room still available but it can be shared by the three companions.

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Burning Strings

I first heard today’s puzzle several years ago from a co-worker who had recently returned from a job interview at Microsoft, where he’d been asked to solve this one in real time.

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Author's picture

Marc Cohen

Computing and data nerd. More about me.


London, UK