A
Aspiria
Sign in
Skill Gym · Thinking

First-Principles Thinking

Break a claim down to what you can verify, then rebuild it yourself.

Rep 1 of 8 · difficulty 2/60 correct
Fermi Field

Adaptive rule: two correct in a row raises difficulty, one miss lowers it. Accuracy so far 0%.

Mastery
0
Score
0% of target 86
Reps logged0
Accuracy0%
Difficulty2 / 6
Method
Explain it simply
from The Feynman technique

Teach it in plain words; the gaps show you what you don't know.

Game task
Fermi Field

Estimate impossible quantities from what you do know.

See this skill on your development profile
Arcade · 60-second games

Play to train first-principles thinking

🏆 0Number Sprint⏱ 60s
Mental maths speed · 60 seconds
Number Sprint

A sum appears with a shrinking time bar. Answer before it runs out. Harder sums and less time as you stay accurate.

Your best: 0

Beginner level

Start here: learn it, check it, use it

Beginner lesson

Break a problem down to what you know is true, then rebuild the answer — instead of copying how it's usually done.

  1. Ask 'what is this really made of?'
  2. List the basic facts.
  3. Question each assumption.
  4. Rebuild from the facts.
Worked example: Why is a bicycle expensive? List parts: frame, wheels, chain. Price each — often the total is far below the shop price.
Beginner check · 0/3
First-principles thinking starts by…
Which is an assumption to question?
Feynman's test for understanding:
Real-life task

Explain to someone younger why ice floats, using only facts you can check.

Free online games