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A tap runs slowly most mornings. Nobody has written anything down. Where do you start?

Read Chapter 1, The Ever-Evolving World of Science, in your NCERT book. The chapter says science is a way of thinking. You ask questions, test ideas, and accept new answers that pass tests.

What you will do

• Drop an idea that a trusted record does not fit.
• Count evidence, the checked facts, for two explanations.
• See how a finer tool shows more.
• Test where a simple model works.
• Compare the results of two groups.
• Pick a test that tells two ideas apart.
• Find the questions one answer can fit.
• Judge a choice by what it does to nature.

Each lesson starts with a small lab. Read the words after it.

Need a quick recap?

• Say what you expect first (Class 6). A guess said first can be tested.
• One try can fool you (Class 6). Repeat a test and take the average.