You've heard of starting a fire with a magnifying glass, but did you know that you can do the same thing with a chunk of ice?
Next time you go winter trekking in your adventure travels, try this:
* Put some water outside in a pot where the first inch or two will freeze into a solid disk.
* Then, using your hands or other source of heat, carefully shape the ice disk into a rough lens shape.
* Test it periodically to determine how it focuses light.
* Eventually you will have an ice lens that can focus enough light to start a fire.
These survival techniques are particularly useful to hikers and travelers in northern or colder regions who may be seeking wildlife sightings or who enjoy mountain climbing.