This week, learners become archaeologists. They explore how we know anything about the ancient world when almost nothing survives intact. Through artifacts, excavation methods, and real case studies, students learn that archaeology is a careful science of clues, not direct answers. They also discover that interpretation always involves inference, and that new evidence can change what we think we know about the past.

SCIENCE FOCUS
This week introduces archaeology as a scientific process of reasoning from incomplete evidence. Students explore how archaeologists use physical clues, context, stratigraphy, and dating methods to reconstruct the past. A key focus is learning the difference between observation and inference—an essential scientific thinking skill that helps us build evidence-based explanations and revise our understanding when new evidence is discovered.

KEY IDEAS

• Archaeologists study the past through material remains called artifacts.
• What survives from the past is incomplete and biased toward certain materials (stone, metal, clay).
• Archaeologists separate observation (what they see) from inference (what they think it means).
• Context (where an artifact is found) is essential to understanding its meaning.
• Relative dating and absolute dating help determine the age of artifacts.
• Scientific understanding of the past changes as new evidence and technology emerge.
• Bias can influence interpretation, even in scientific work.

• Artifact – An object made or used by humans in the past (tools, pottery, bones, jewelry, buildings).
• Excavation – The careful removal of soil to uncover buried artifacts.
• Stratigraphy – The idea that deeper soil layers are generally older than layers above them.
• Observation – What you can directly see or measure from evidence.
• Inference – A conclusion or explanation based on evidence, not directly observed.
• Relative Dating – Determining whether something is older or younger than something else (not exact age).
• Absolute Dating (Carbon Dating) – A scientific method that estimates the age of once-living materials using carbon-14 decay.
• Half-life – The time it takes for half of a radioactive substance (like carbon-14) to decay.
• Context – The location, surroundings, and position where an artifact is found.
• Bias – Pre-existing assumptions that can influence how evidence is interpreted.

• Why is it so hard for archaeologists to know exactly how people lived in the past?
• How can two archaeologists look at the same artifact and come to different conclusions?
• What does the Fu Hao example show about how assumptions can shape interpretation?
• Is it possible to completely remove bias when studying history? Why or why not?
• Can scientific interpretations of the past change over time? What causes those changes?

• What do you think would survive from your life 2,000–3,000 years from now? What would disappear completely?
• If your bedroom were excavated in the future, what might archaeologists get wrong about your life?
• What kinds of evidence would you wish archaeologists had, but probably wouldn’t survive?