Holidays are a good time to find the answer to complex mathematical problems using household items, MacGyver-style. One way to find pi (yes, that pi) involves a flat surface, a little twig or pin, and ...

In the adding-insult-to-injury department, being pricked multiple times with a needle while a nurse tries in vain to find a vein ranks pretty high. The problem can be acute with infants and the obese.