Answer: Beijing, Central Park
This example of a butterfly moving air in Beijing, and thus effecting the weather in Central Park, is an example of how small changes vastly effect an outcome. This explanation goes over Ellie's head, so he tries using a drop of water on her hand. In Jurassic Park, Hammond is trying to control too many variables. The sex of the dinos, the enclosures, the rides, the computers, the guests, his staff, and so on. If each of these variables has slight changes, then predicting the outcome is impossible; that's Chaos Theory. As Malcolm tries to explain earlier, trying to have too much control leads to disarray. No man can control everything, especially an extinct ecosystem that, as Ellie puts it, "we know nothing about."