Students prefer to experiment in order to understand. We call it hands-on experience. In this case the students don’t expect to find everything ready made in the photocopied teacher’s notes but they rather learn through various experiments which includes mistakes. Mistakes are not to be viewed as something negative but rather steps towards a better understanding.
Most of the famous scientists, inventors, innovators, creative people, experimented an infinite number of times. Finally, after so many years of perspiration, they got the answer that they were looking for. Here is the link.