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YOUTH & CHILDREN


deepa ramanathan & kritika sukumar, nj


You are about to leave for the holidays, but you forgot socks! You race back to your room, but all the lights are off! You open your drawer, remembering there are 10 pairs of white socks, 10 pairs of black socks, and 11 pairs of blue socks, but are all mixed up. How many socks do you need to take to be sure to have at least one matching pair?


A man wants to cross a river using a boat which can fit himself plus either a wolf, a goat, or a cabbage. If the wolf and goat are alone on a shore, the wolf will eat the goat. If the goat and the cabbage are alone on the shore, the goat will eat the cabbage. How can the man bring the wolf, the goat, and the cabbage across the river?


Answers on page 56!


What do to?? Fill the bottle with water to the very top. Keep the plastic card on the top of the bottle. Make sure there is a little water on the mouth of the bottle when you do this. Carefully remove your hand and flip the bottle upside down into the sink. The water stays in the bottle. The card acts like a lid. How did this happen?? How come gravity is not pull- ing the card and the water down???


What do you need?


1. Plastic bottle 2. Water 3. Cardboard/ Card


42


What happened?


The air pressure is pushing up the card. This creates a seal that is more powerful than gravity.


Modifications  Fill half the bottle with plain water.  Fill the bottle full with soap water.  Try to wet the card in plain water before using it to cover the bottle.


March 2012


Two fathers took their sons fishing. Each father and son caught 1 fish, but when they returned to camp there were only 3 fish. How could this be? (None of the fish were eaten, lost, or thrown back.)


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