Study Guide: Chapter 3 — The Spark

Core Idea

Reject both the Principle of Mediocrity and Spaceship Earth. People are universal explainers and constructors: anything not forbidden by physics is achievable with the right knowledge. Life support is built by knowledge, not given by a benevolent biosphere.

Key Terms

Principle of Mediocrity (rejected) · Spaceship Earth (rejected) · universal constructor · momentous dichotomy

Case Summary

A typical cosmic place is 2.7 K vacuum. Earth's biosphere killed early Rift Valley humans; fire, clothing, medicine — knowledge — made survival possible.

Application Checklist

• [ ] Spot where mediocrity-humility caps ambition below physics
• [ ] Identify "given" life-support that is actually built knowledge
• [ ] Reframe an impossible goal as a knowledge problem

Self-Test

1. Why are Mediocrity and Spaceship Earth both false?
2. State the momentous dichotomy.
3. What actually makes Earth habitable, per Deutsch?