Riddle: How can you measure nine minutes with have two hourglasses, one four minute and one seven minute?
Answer: Turn over both hourglasses at once. When the four-minute hourglass runs out, turn it over. When the seven-minute hourglass runs out, turn it over. When the four-minute timer runs out this time (eight minutes have elapsed), the seven-minute hourglass has been running for one minute. Now turn over the seven minute timer back over. When the timer runs out, nine minutes have elapsed.
Riddle: Three-fourths of a cross, and a circle complete, An upright where two semicircles meet, A rectangle triangle standing on feet, Two semicircles, and a circle complete. What is it?
Riddle: There is one word in the English language which is universally considered a preventive of harm; change a certain letter in it, and you make it an act of cruelty. What are the words?