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Ask Marilyn: When Are You Twice as Old as Your Child?
Jim Hurst of Coatesville, Pa. writes:
Marilyn: There is only one time in your life when you’re twice as old as your child. When is that?
This is actually a fun logic—not math—question, readers. Think about it awhile before checking the answer; it appears at the end of the column.
Miles Klein of Frisco, Tex. writes:
Marilyn: Why do ice cubes melt faster when you pour cold water on them?
Even though the water is cooler than the surrounding air, water is much denser (has more particles per unit volume) than air. So as water is much warmer than ice, anyway, its many particles—and in this case, they’re flowing, too—warm it faster than the air would alone.
Answer: When the child reaches the age you were when he or she was born. You’ll stay “twice as old” until your next birthday.