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SCIENCE

What makes the stars shine? Why is the sky blue? How did life start on Earth? Science explores and tries to understand everything in the world.

WHAT DO SCIENTISTS DO?

A scientist uses knowledge and a logical approach to solve a problem or explain an observation. Scientists use instruments to study forces, disease, and materials. Without scientists, we would not have gone to the Moon, discovered penicillin, or developed computers.

WHAT IS SCIENTIFIC METHOD?

Scientists create a theory to explain observations. Theories are often written as equations. A good theory makes predictions that can be tested by further observations and experiments. A trial theory is called a hypothesis. If its predictions are correct, the hypothesis is supported.

WHY DO SCIENTISTS PERFORM EXPERIMENTS?

An experiment is a practical test of a theory. By performing experiments, scientists seek answers to questions. They use measuring instruments to record the results of their experiments as numbers.

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Biology
Chemistry
Physics

Copyright © 2007 Dorling Kindersley

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