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Tricky Lateral Thinking Puzzles - Solution for #24

Solution for #24

The men have gone spelunking and have taken an Igloo cooler with them so they can have a picnic down in the caves. They cleverly used dry ice to keep their beer cold, not realizing that as the dry ice sublimed (went from a solid state to a vapor state) it would push the lighter oxygen out of the cave, and they would suffocate.