The Ever-Evolving World of Science

Overview

Science is a way of understanding the world by observing, questioning and testing ideas. Our knowledge keeps growing and changing as new evidence is found. This chapter shows how curiosity, experiments and reasoning help science evolve over time.

Key concepts

• Science begins with observation and curiosity about nature.
• The scientific method: observe, ask a question, form a hypothesis, experiment, conclude.
• Scientific ideas can change when new evidence appears.
• Discoveries are made by people across all countries and ages.

Important terms / formulae

• Observation: noticing something carefully using our senses.
• Hypothesis: a possible explanation that can be tested.
• Experiment: a fair test done to check an idea.
• Evidence: facts gathered to support a conclusion.

Solved example or key process

1. Observe that a plant near a window bends toward light.
2. Ask: does light affect the direction of growth?
3. Hypothesis: plants grow toward light.
4. Experiment with plants in different light directions and record results.
5. Conclude based on the evidence collected.

Important questions

1. What are the main steps of the scientific method?
2. Why can scientific knowledge change over time?
3. How does curiosity help in doing science?
4. Give one example of a fair test.

Quick revision

Science grows through curiosity, observation, hypotheses and experiments. Ideas are accepted only when supported by evidence, and they keep evolving as we learn more.