How To Research Science Fair Topic(s). 10-20 Points for most detailed answer!?

I've been told to narrow it down to 3 topics that I would like to do for my Pre-Ap Biology class. I've chosen: 1. The Effect of Soft Drinks Upon Digestion under Biochemistry 2. Fluctuation of a Liquid In The Container under Physics 3. The New Magic Formula for Eliminating Bad Breath under Chemistry I... show more I've been told to narrow it down to 3 topics that I would like to do for my Pre-Ap Biology class. I've chosen:
1. The Effect of Soft Drinks Upon Digestion under Biochemistry
2. Fluctuation of a Liquid In The Container under Physics
3. The New Magic Formula for Eliminating Bad Breath under Chemistry

I have to research these topics -- read & educate myself w/ anything related w/ each project. I have to list 3 resources for each project idea. Can someone tell me where to look to research these 3 topics? I've used my search engine -- it's not really helping? Any Ideas please, 10-20 Pts. for most detailed answer!!!!!!! Thank you!
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