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Anything solar.. like solar car or solar coocker
rainwater harvesting 
life cycle of any organism.. like silkworm, cockroach, humans, etc

hope this is useful.. best of luck for ur science  exhibition

thank u,
2 2 2
For science Exhibition u can make :-

1. Spy robot

2. Solar car

3. metal detector

4. Fire alarm

5. Robot
1 3 1
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