Most commonly, patients describe acute tenderness in the buttock and sciatica-like pain down the back of the thigh, calf and foot. Typical piriformis syndrome symptoms may include: 1  A dull ache in the buttock. 2  Pain down the back of the thigh, calf and foot (sciatica).
We think of ice as snowflakes, ice cubes, snow cones, and dangerous patches on the sidewalk. Scientists have many different ways of categorizing ice too! There are actually fourteen types of ice that exist in different environments.
Regular ice is made from freezing water. Water freezes at zero degrees Celsius, or +32 degrees Fahrenheit. (Most of Europe and all scientists use Celsius because we're lazy and it's easier, but the US is still stuck on the Fahrenheit temperature scale.) Dry ice is made from frozen carbon dioxide gas.