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Riddle:
If boiling water is poured into a thick drinking glass as well as a very thin wine glass. Which of the two is more likely to crack?
Answer: The thick glass is more likely to crack since glass is a poor conductor of heat. In a thin glass, the heat passes more quickly from the glass into the surrounding air, causing the glass to expand equally. When hot water is poured into a thick glass, the inner surface expands, but the outer surface does not. It is this extreme stress on the glass that causes it to crack.
Riddle:
I wiggled and cannot see, sometimes underground and sometimes on a tree. I really don't want to be on a hook, and I become a person when combined with a book. What am I?
Riddle:
I appear to be real but I'm not, I'm perfectly accurate but deceiving, I have no feelings or emotions, but the individual I'm mimicking does. What am I?