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The sound a whistle makes travels much farther than the human voice can. So, next time you go camping or hiking with your family, it's a good idea to carry a whistle … just in case! If you happen to get separated, there's a good chance that the high-pitched squeal of a whistle can be heard for quite a distance. Encourage your kids to play this fun game of Whistle Hide-and-Seek as a warm-up to get them prepared for finding a "lost" camper.