Unit 2: The Nature of Science

Introduction to Science and Scientific Knowledge

  • Definition of Science (Oxford Dictionary): The intellectual and practical activity encompassing the systematic study of the structure and behaviour of the physical and natural world through observation and experiment.
  • Components of Scientific Knowledge: Science is not merely a collection of data; it encompasses ideas, facts, principles, laws, and theories.
  • The Scope of Science: The primary aim of science is to explain the natural world. It specifically does not encompass explanations for the supernatural.
  • Is Knowledge Sufficient? Scientific knowledge alone is not sufficient for learners. They must also understand the processes through which that knowledge is generated.

The Scientific Process and Way of Thinking

  • Process of Science: This refers to the specific activities scientists engage in while gathering data and constructing new scientific knowledge (Vhurumuku, 2010).
  • Carl Sagan's Perspective: Science is defined as being "a way of thinking more than it is a body of knowledge."
  • Core Scientific Activities:
    • Observing nature using the five senses.
    • Formulating specific problems or questions.
    • Stating a hypothesis to be tested.
    • Conducting experiments.
    • Collecting information or data.
    • Analysing results derived from data.
    • Making conclusions and logical deductions.
    • Communicate findings to others through various means of dissemination.

Defining the Nature of Science (NoS)

  • Definition of "Nature" (Oxford Dictionary): The basic or inherent features, characters, or qualities of something.
  • Definition of NoS (Clough, 2007): The Nature of Science refers to what science is, how it works, its epistemological and ontological foundations, how scientists operate as a social group, and how society influences and reacts to scientific endeavours.
  • Philosophical Foundations (Denzin & Lincoln, 2011):
    • Epistemology: The theory of knowledge and its justification.
    • Ontology: The nature of reality and the truth.

Scientific Literacy and Its Importance

  • Scientifically Literate Individuals: These individuals possess an understanding of basic scientific knowledge, the NoS, and the complex relationships between science, society, technology, and the environment.
  • Practical Benefits of Science Literacy:
    • Enables individuals to make informed decisions regarding hygienic products and food.
    • Assists in identifying ways to avoid diseases.
    • Allows citizens to understand issues relating to scientific research.
    • Provides justification for the use of taxpayers' money to fund specific research projects.

The Seven Tenets of the Nature of Science

1. Science is Empirically Based
  • Science depends on and demands evidence to support its claims.
  • Evidence can be obtained through observation or experimentation.
  • Example Scenario: Consider the claim "All metals expand when they are heated."
    • Is the claim reasonable?
    • Can it be demonstrated that metals expand upon heating?
  • Caveat: Just because scientific knowledge is supported by evidence, it does not necessarily make it "true" in an absolute sense.
2. Scientific Knowledge is Tentative, Yet Durable
  • Scientific knowledge is subject to change or addition; it is never finalized.
  • Atomic Theory Example: The conception of the atom has changed multiple times throughout history as new evidence emerged.
  • Impact of Technology: New evidence obtained from improved equipment frequently changes existing conceptions of ideas.
  • Truth vs. Evidence: Even when robust evidence is provided, scientific knowledge does not become absolute "truth."
  • Reflection: As an example of the limits of direct experience, has anyone ever actually "held" an electron?
3. The Difference Between Observation and Inference
  • Observations: These are based strictly on the five senses: smell, sight, taste, hearing, and touch. Scientific instruments are frequently used to aid and extend these senses.
  • Inferences: These are deductions or conclusions derived from observations. Inferences are heavily dependent on background knowledge.
4. Scientific Knowledge is Theory-Laden, Yet Partly Subjective
  • Scientists are human beings; therefore, subjectivity in science is inevitable.
  • Prior Knowledge and Bias: A scientist's existing knowledge influences the bias of their observations.
  • Data Selection: Scientists must choose what to observe and what to ignore.
  • Interpretation: Different scientists may reach different inferences even when analyzing the exact same set of data.
5. Imagination and Creativity Play a Role in Science
  • A common misconception is that scientists only observe nature or conduct rigid experiments to make deductions.
  • While observation and experimentation are vital, imagination and creativity are equally crucial for the advancement of science.
6. There is No Single Scientific Method
  • The Misconception: Many learners and teachers believe all scientists follow a universal series of steps known as "the scientific method" (Vhurumuku, 2010).
  • Typical Steps Cited in the Misconception:
    1. Observe something in nature.
    2. Formulate a problem for investigation.
    3. Formulate a hypothesis to be tested.
    4. Design experiments to collect data.
    5. Make relevant observations or take relevant measurements.
    6. Interpret observations or analyse results.
    7. Form conclusions.
    8. Report results.
  • Assumptions of the Misconception: The belief that following this procedure allows one to "act like a scientist," ensures replication, and guarantees that the resulting knowledge is "true."
  • Origin of Misconception: This misunderstanding is often caused by the structured manner in which research is reported in academic journals and textbooks.
7. The Difference Between a Law and a Theory
  • The Misconception: The belief that a theory becomes a law once it has been proven "beyond reasonable doubt."
  • The Distinction:
    • Law: Describes what happens in nature.
    • Theory: Explains why it happens.
  • Theory Composition: A theory is the end product of scientific knowledge, compiled from facts, observations, hypotheses, predictions, and laws.
  • Comparative Examples:
    • Gases:
      • Fact: The volume of a gas increases upon heating.
      • Law: Charles' Law: V1T1=V2T2\frac{V_1}{T_1} = \frac{V_2}{T_2}
      • Theory: The Kinetic Molecular Theory.
    • Gravity:
      • Fact: Objects fall.
      • Law: Newton's Law of Universal Gravitation: F=Gm1m2r2F = G \frac{m_1 m_2}{r^2}
      • Theory: Einstein's Theory of Relativity (warping the geometry of space-time).
    • Evolution:
      • Fact: Species evolve over time.
      • Law: Lamarck's Law of Use and Disuse.
      • Theory: Darwin's Theory of Natural Selection.

Contrasting Science with Other Ways of Knowing

Scientists vs. Detectives (Insights from Mia Abrie)
  • Inquiry Goal: Scientists ask questions to discover new info about natural phenomena; Detectives ask questions to discover what happened in a specific event.
  • Observation: Scientists use scientific inquiry; Detectives use surveillance.
  • Proposals: Scientists propose hypotheses based on prior knowledge; Detectives propose likely scenarios based on experience.
  • Evidence: Scientists collect/analyze/interpret data; Detectives (with forensic help) collect/analyze/interpret evidence.
  • Explanations: Scientists construct explanations using reasoning to justify them; Detectives construct scenarios to infer or deduce happenings.
  • Critique: Scientists evaluate or critique other scientists' explanations; Detectives evaluate alternative scenarios to exclude other possibilities and suspects.
  • Communication: Scientists communicate research to peers and the public; Detectives present evidence to prosecutors and courts.
Pseudoscience
  • Ideas that are wrongly portrayed as scientific.
  • Examples: Energy medicine and homeopathy.
Indigenous Knowledge Systems (IKS)
  • Knowledge that develops within specific societies, often generated for survival (food, shelter, health).
  • Transmission: Orally transmitted, or through demonstration and imitation.
  • Methodology: A consequence of engagement with nature, reinforced by experience and trial-and-error methods.
  • Nature of Knowledge: Repetition retains empirical rather than theoretical knowledge.
  • Sharing: It is shared to a larger degree than other forms of knowledge.
  • Fragility: It may disappear due to the intrusion of foreign technologies.
Non-Scientific Ways of Thinking: Religion and Faith
  • Includes religion, humanism, Ubuntu, ethics, and traditional practices.
  • Involves the recognition of elements that are beyond human control.