Bacteria on chopping boards
Our hypothesis has been proven to be true. Wooden chopping boards have less bacteria compared to old plastic chopping boards.
This science fair project may be repeated, this time, with different types of boards like ceramic or glass.
Modify the science project experiment, using other cleaning agents such as antibacterial soap, Listerine or Clorox.
Wooden versus plastic cutting boards - http://www.reluctantgourmet.com/cutting_board.htm
Chopping boards - http://www.homeimprovementpages.com.au/article/Chopping_Boards
The bacteria should be destroyed before it is disposed of. Pour some bleach into the petri dish to kill all of the bacteria before disposal.