
I decided to do a project on how much bacteria was spread by double dipping. I had gotten the idea from Mythbusters, and their inspiration came from Seinfeld. I thought that it sounded like a fun project, and I wanted to test it for myself.
I had to do a lot of research just to find a little bit of information about double dipping. There have really only been two studies, and I could not derive much from those, so I did a lot of this project on my own. I had to figure out how to collect and culture bacteria safely.
After analysis of all my data, I conclude that double-dipping does, in fact, spread bacteria into the presented dip. My first hypothesis was supported by the results that there was an average of a 6% increase in all of the experiments. 92% of the petri dishes grew more bacteria in them compared to the control.