Riddle: A mile from end to end, Yet as close to you as a friend. A precious commodity, freely given. Seen on the dead and on the living. Found on the rich, poor, short, and tall, But shared among children most of all. What is it?
Riddle: I'm sometimes white, and always wrong. I can break a heart and hurt the strong. I can build love and tear it down. I can make a smile, but more often bring a frown.
What am I?
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.