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The bottle sling knot has been around for centuries. This ancient method of forming a sling for the neck of a jug or bottle this knot was described in detail by the Greek physician Heraklas in his first century book on surgical knots and slings. With a little practice you’ll be able to master this interesting, useful knot.
Here’s a lightning safety infographic explaining the ’30/30′ rule – if the time between the flash of lightning and the sound of thunder is thirty seconds or less take shelter until 30 minutes until the last thunder is heard. Many wait too long to take shelter and leave shelter too soon, risk is greatly decreased by following the 30/30 rule.