## Posts tagged ‘cold’

### SudoClue for a Cold Winter’s Night

The holiday break is nigh, which means you need to be careful not to catch a cold.

For many people, the time preceding a holiday, vacation, or spring break is busy — finishing up a term paper, completing holiday shopping, or getting things off your desk so you can enjoy your trip to Tahiti. During that time, your immunity kicks into high gear. It helps to fend off germs while you’re pushing yourself to get stuff done. When your break finally comes, though, you relax, and your body thinks, “Oh, cool, the stress is over.” And BAM! No more immunity, and your body succumbs to infection. Sniffles, headache, and a cough ensue.

How can you prevent this?

Easy. **Do puzzles.**

That’s right. You can trick your body into thinking that you’re still stressed by doing crosswords, sudoku, nurikabe, battleship, nonogrids, or whatever you like. Your mind is working hard, so your body keeps your immunity up. Doing something you enjoy fends off disease. Win-win.

Well, MJ4MF is here to help. The following **SudoClue** puzzle will provide a half-hour of much-needed stress. The idea is rather simple. Use the clues to fill in the corresponding squares of the 6 × 6 grid, then fill in the remaining squares like a sudoku puzzle.

The puzzle below, as well as an easier version, are available in PDF format.

**SudoClue Puzzle – Easy** **SudoClue Puzzle – Hard**

Enjoy!

- Number of unique tetrominoes
- Product of all single-digit divisors of 143
- Number of English words that end with –
*dous* - Half of π
^{2}, approximately - Number of tetrominoes that can be drawn without lifting your pencil from the paper
- 0!
- Number in the title of the greatest math joke book ever
- Integer between
*e*and π - Circumference divided by radius, to the nearest whole number
- Smallest number of colors sufficient to color all planar maps
- V
- Side length of a square whose area (in square units) is equal to its perimeter (in units)
- A perfect number
- A hat trick
- For integer values of
*n*, the smallest prime divisor of*n*^{2}+*n* - Number of total handshakes when four people shake hands with each other

Don’t feel like thinking too much on holiday break? Fine, **here’s a hint**. And if you’ve already fully entered holiday break mode, **here’s the solution**.

### Temperature of McDonald’s Coffee, and Other Celsius Benchmarks

I am so done with cold weather. Northern Virginia had trouble breaking 40°F in January. Granted, we’re not International Falls, MN, where the temperature had trouble surpassing the legal drinking age, but I am still ready for spring.

In January 2005, I went skiing near Montreal. At the bottom of the mountain, a thermometer showed the temperature to be ‑25°C. Next to the thermometer was a sign announcing that the temperature at the top of the mountain was ‑20°C. My buddy said, “Quick, let’s get on the lift. It’s 5° warmer at the top.”

Really? If you can tell the difference between ‑25°C and ‑20°C, you’ve spent too much time in North Dakota.

Back home, I was telling a friend about the trip. I mentioned that it was ‑25° on the mountain. I failed to include the temperature scale, and she actually asked, “Celsius or Fahrenheit?” All I could think was, “Does it matter?” It was cold! C-O-L-D!

International travel can be tough if you need to continually convert between temperature scales. Here’s an annotated Celsius thermometer with some benchmarks:

A related trivia question for which very few folks know the answer (without computing it): At what temperature does degrees Celsius equal degrees Fahrenheit?