Science is about predicting the future.
Not the "who will I marry" future but, given a certain set of circumstances and conditions, science can predict particular outcomes within a degree of certainty.
So you can work out using Newton's laws of motion if that black ball will go into the corner pocket to win you the game. As the variables increase the task of prediction becomes increasingly hard.
Farmers rely on science every day, none more so than when they listen to the weather forecast. While weather forecasting is complex we have become better at it, enabling farmers to make decisions much earlier than they would have been able to make in the past.
Understanding the southern oscillation -- the warming and cooling of the southern ocean producing the El Nino and La Nina effects -- gives farmers an early heads up that a drought is highly likely.