Science Fair ideas!!?

[Vishnu5315]

I am a grade 9 student.I have got to prepare for a science fair which is to held in september 2008.Give me some ideas which will score me the first place.I have got these subjects to try from:PhysicsChemistryZoologyBotany.

[rusted_gut]

Stirling engine driven by the sun (lens) always works pretty good

[AayushPareek]

in physicstry to get the chip of amplephere

[MaeVin]

Last month my school also got a science exibition. I was in chanrge of the physics and chemistry. Hope I can give u some useful ideas.Physics- solar bateriesChemistry- soap- bath bombZoolagy- bisect a frogBotany- extract DNA from plants