Smudgy GlassSituation puzzles (sometimes called lateral thinking puzzles) are ones where you need to ask lots of yes or no questions to figure out what happened in the situation. These are good puzzles for groups where one person knows the puzzle and answers the questions.
There once was a small family named Smith. The father had to work all day, and often the mother took her kids with her to go grocery shopping on the weekends. One winter day in the middle of December, it was once again a weekend and Mrs. Smith once again had to go grocery shopping. But this time, the oldest child David (who was twelve), decided that he was old enough to stay home with the younger kids: a 3-year-old (Tim) and a 4-year-old (Jane). Anyway, Mrs. Smith agreed and went out shopping without them. The whole time, she worried and worried about her kids at home alone and finally rushed home as fast as she could. When she got home, she found her kids safe and relatively happy. She also found a whole bunch of smudgy fingerprints all over the glass windows! Mrs. Smith was not very happy about this and accused David of making them.
"I didn't do it, Mom, I swear! It was the younger kids!" David said. Unfortunately for him, his mom was no fool and had proof that he had made the smudges. What proof did she have?
HintThink about the age differences between David and Tim and Jane.
AnswerMrs. Smith looked carefully at the smudges and concluded that Tim and Jane couldn't have made them because they were too high up! David confessed that he had been looking outside, and his breath had fogged up the glass. He thought it would be fun to make pictures in the fog, and he did, leaving smudgy fingerprints behind. Needless to say, David was grounded for lying to his mom.
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