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The Challenge: Make an Antibacterial Cream

What else do bacteria need?

Because we want to make a cream that destroys bacteria living in or on humans, we need to provide the bacteria with an environment which is broadly similar to that found in or on our bodies. Our mouths are a good home for bacteria. They tend to be humid and at a temperature of about 37oC (98.6o F), so it's logical to grow bacteria at the same temperature. If it gets too hot (say over 40oC, or 104o F) the bacteria will die but if it gets too cold the bacteria simply won't grow.

Bacteria growth chart