Montessori saw that young children were full of curiosity and loved exploring new things for themselves. She also saw that they wanted to explore things in increasingly complex ways. When she experimented with what they might be interested in she was astonished just how much they wanted to know and how much they were able to remember. She therefore tried to find ways to help them understand the world beyond their own environments. She developed a wide range of beautiful materials that allowed the children to gain an appreciation of biology, geography, simple science and history. Each of these areas then allowed the children to explore and experiment with concepts such as metamorphosis, life cycles, land formations, the planets and time lines. As in all other areas of her work she was careful to let the children lead her in their interests and she was surprised to find that they very easily learnt not only the simple, but also the technical names of the new things that they were introduced to. In fact, Montessori children frequently astonish adults with their in-depth knowledge of the subjects they are studying.