Science and Justice students learned more about making their trials in their science projects extremely precise. Replicability is what helps our scientific knowledge expand and grow. Dr. Kulmala explained that if they changed any parameter, they must do a new trial. For an example, she talked about how asthma inhalers used to use CFCs (chloro-fluorocarbons. CFCs contribute to increasing the hole in the ozone layer of the atmosphere. When manufacturers decided to eliminate CFCs from inhalers, they needed to conduct new tests, even though the medication itself did not change. Science & Justice students need to design their own trials to be precise and reproducible.