This week in science we did challenges. my favorite challenge  was a penny  challenge. In the penny challenge each group got a bowl of water, a small piece of tinfoil,  and some pennies. The object was to build a boat out of tinfoil then to put it in the water and drop pennies in to it slowly and to get a lot of pennies in it with out it sinking or getting water in it. The most my group got was 35 pennies.  The hardest part was to make sure the boat had no holes or some places where a hole would open up.