A carpenter was working in Reena's house. He dropped his box of nails on to a heap of wood shavings. Reena was able to help him collect the nails easily and quickly. What do you think she did?
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Solution
Reena must had used magnet to collect the nails. Nails are made of steel. A magnet attracts steel. Hence, all the nails would get attracted to the steel and Reena would have collected them easily.