Figure out where you are in the world using just a few clues.
, and find its solution at the bottom of today’s article. Be careful not to read too far ahead if you haven’t solved last week’s yet!You are standing somewhere on the surface of the Earth. You walk 1 mile south, then 1 mile west, and then 1 mile north, and you end up back at the same point where you started. Where are you? Assume the Earth is a perfect smooth sphere.The most natural answer to this question is the North Pole.
The South Pole doesn’t work. Traveling south from the South Pole isn’t even a meaningful concept, since moving south is by definition movingthe South Pole. It helps to remember that we’re on a big sphere. Think of lines of latitude not actually as horizontal lines but as circles traced around the globe that get progressively wider toward the equator and narrower toward the poles.Good luck solving the puzzle this week, and rest easy that your career doesn’t depend on it.
I’ll be back next Monday with the solution and a new puzzle. Do you know a cool puzzle that I should cover here? Send it to me at [email protected] ? You can guarantee that you catch the mouse in six days. There are several solutions. Numbering the cabinets in order from 1 to 5, one solution is to check them in this order: 2, 3, 4, 2, 3, 4. A clever observation is that the mouse must alternate between odd- and even-numbered cabinets each day.Suppose the mouse begins in an even-numbered cabinet. How could you catch it in this case? On day one, you open cabinet 2. If the mouse is in there, you win.
If these are your first three moves and you do not uncover a mouse, this means that the mouse must have begun in an odd-numbered cabinet. So where is the mouse the morning of day four? Since it started in an odd-numbered cabinet and it alternates between even and odd each day, the mouse must be in an even-numbered cabinet on day four.
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