However, the "rules" are more like general guidelines.
Obviously, you can last a lot longer outside when it's warm than when it's freezing.
Lice have six claws designed to hold onto a single hair shaft.
You can live without air conditioning and indoor plumbing, but there are some true necessities of life.
You can't survive for long without food, water, sleep, or air.
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Survival experts apply the "rule of threes" to lasting without essentials.