The question as it appears in the 05/03 edition of Specs & Techs from GlobalSpec:
You and your buddies are canoeing in the Rain Forest and looking for a good spot to set up camp. Unfortunately, the canoe capsizes and you lose just about all of your gear. However, you are able to grab one of the backpacks before the current sweeps everything away (including the canoe). Frantically looking through the backpack, you discover there isn't much in there besides a mini-propane tank, some wire, a Swiss army knife and a six-pack of beer (the real important stuff - matches, flares, etc. - is gone). There you all are - stuck in the middle of nowhere, it's muggy and damp, getting late and you need to be rescued. (Obviously there's no cell phone coverage so you can't call for help.) You did notice the occasional plane flying overhead throughout the day so you want to be able to send up some kind of light signal should one approach during the night. What can you do?
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