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Throughout history, human beings have had a strong sense of curiosity. Human curiosity led to the use of fire, the building of tools, and the development of languages. Have you ever checked what was living at the bottom of a pond? Taken off the cover of a baseball to see what was inside? Tried putting more chocolate or less in your milk to find out how much would give the best flavor? These are all examples of curiosity, and curiosity is the basis of science.
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Science is a system of knowledge and the methods you use to find that knowledge. Part of the excitement of science is that you never know what you will find. For instance, when you flip over a rock, will you see crawling insects, a snake, or nothing at all? You won't know until you look. 
Science begins with curiosity and often ends with discovery.
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Curiosity provides questions but is seldom enough to achieve scientific results. Methods such as observing and measuring provide ways to find the answers. In some experiments, observations are qualitative, or descriptive. In others, they are quantitative, or numerical. Some experiments are impossible to do, such as observing what happened at the start of the universe. Scientists cannot go back in time to observe the creation of the universe. However, they can use the evidence of the universe around them to envision how this event occurred.
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