Grow Naturally Think Clearly
A quiet English library. Clear your mind. Keep what is yours.
Discover the library Start from a topic. Open a question pack or a book pack, or draw an insight.
Thinking Tools
Decision and Judgment
Concept
Trade-offs
Every choice spends something else: cash, time, attention, or a return you will not see. Name what you give up before you commit, and compare options on the same scarce resources, not on slogans. A clear trade-off leaves fewer regrets than a choice that only counted the upside.
Concept
Sunk Cost
Staying with a bad path because of what you already spent, instead of judging only future costs and benefits. Past tuition is gone either way. Restart the decision from today: what will you spend next, and what will you get, if you continue versus if you stop.
Concept
Loss Aversion
Losses hurt more than equal gains feel good. Ownership intensifies the pull toward the status quo, so people hold losers too long and sell winners too early. Separate how a result feels from whether the next bet still has edge, and size from expected value, not from pain avoidance.
Concept
Anchoring
First numbers or frames stick, and later judgments stay too close even when better information arrives. A list price, a first forecast, or a peer’s guess can quietly become the center of your range. Reset by writing an independent estimate before you look at the anchor again.
Concept
Present Bias
Near rewards feel larger than later ones of equal or greater value, so plans slip toward now. Deadlines, defaults, and pre-commitments shrink the gap between intention and action. Make the future choice easier in the present, or the present will keep winning by default.
Across Disciplines
Buffett Investing Toolkit
Concept
Margin of Safety
Buy or build with a buffer between your estimate of value or capacity and what you pay or load, so ordinary errors and bad luck do not wipe you out. Pay well below intrinsic value, or plan capacity for spikes, and size the cushion to uncertainty rather than to hope.
Concept
Circle of Competence
Know where your real edge is: skills, judgment, and relationships that justify action. Stay there until you honestly widen the circle. The border matters more than the size. For outside bets, hire, partner, or use rules instead of pretending you already understand the game.
Concept
Mr. Market
A manic-depressive partner who offers to buy or sell your share of a business at a new price every day. You may trade with him or ignore him. His mood is not a verdict on value. Use quotes as opportunities when your own estimate of worth is sound, not as daily instructions.
Concept
Intrinsic Value
An estimate of what a business is worth from the cash it can deliver to owners over time, discounted for risk and delay, not the price printed on the exchange today. Build a range from durable economics, compare it to market price, and buy only with a cushion when price sits well below that range.
Concept
Compound Interest
Each period’s return is reinvested into the base, so the next period earns on a larger principal: interest on interest. Start early, avoid needless fees and churn, and prefer businesses that can retain earnings productively. The same curve appears in skills and trust when returns stay in the system.
CEFR Vocabulary
Upper Intermediate
Word
abandon
/əˈbændən/
Leave someone or something permanently; stop supporting, following, or pursuing a plan when it no longer makes sense to continue.
They had to abandon the car in the snow and walk to the nearest town before night fell.
Word
absorb
/əbˈzɔːb/
Take in liquid, sound, heat, or light into a material, or take in information so it becomes part of what you know.
Blotting paper absorbs spilled ink within seconds, leaving only a faint stain on the desk.
Word
abstract
/ˈæbstrækt/
Existing as an idea rather than as a concrete thing you can touch, point to, or photograph in the world.
Philosophy tutorials often begin with fairly abstract questions before anyone offers a worked example.
Word
accurate
/ˈækjərət/
Correct and exact; free from mistakes, rough guesses, or distortion that would mislead a careful reader.
The report needs accurate figures, not rough guesses, before the board will approve the budget.
Word
adapt
/əˈdæpt/
Change behavior, form, or method to fit new conditions without losing the core purpose of the work.
Firms that adapt quickly survive sudden demand shifts that strand slower rivals with the wrong inventory.
Packs group terms: words, phrases, and concepts, with clear glosses and examples. Keep a term as Known or Saved as you go. Progress stays on the pack, not on a streak.
Keep what matters while you read. Known when a note lands. Saved when you want another look. Come back. Know yourself better.
Live ticket days unlock the full library and search. Preview notes stay open without a live ticket. This is a free period. Redeem a 7-day ticket in Settings whenever you have no live days. Each ticket adds 7 days. Days start when you redeem. They do not renew on their own. Nothing to pay today. The prices are what tickets will cost if they go on sale later.
Frequently asked questions
