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Challenge your students to take on a real life problem affecting people in Nepal.
The problem: In Nepal many farmers living on the mountainside grow fruit and vegetables, including tomatoes. To earn a living they need to sell these at the local market. The problem is getting to market involves a long, dangerous walk down the mountain side and over a river, at the end of which the tomatoes may well be a bit squashed.
The challenge: To design, build and test a way of moving tomatoes that won't squash them!