Edition No. 0
| Volume I | Daily Edition

rational.today

A Daily Digest of Rational Thinking | BREAKING: Clarity demands it
LEAD STORY

Think Clearly
or Don't Think at All

The examined life demands a discipline most refuse. Every proposition must survive contact with evidence. Every belief must earn its place.

EPISTEMOLOGY

The Burden of Proof Is Yours

Every claim you make is your responsibility to substantiate. The default state of any proposition is not acceptance — it is suspension. To assert is to incur a debt to evidence. Those who demand that others disprove their claims have inverted the rational order.

This is not merely an academic rule. It is the foundation of honest discourse. When someone says "prove me wrong," they are refusing to do the intellectual work they have assigned themselves by making an assertion in the first place.

Rational discourse requires that the claimant carry their burden without complaint. The strength of an argument is not measured by how loudly or repeatedly it is made.

LOGIC

Correlation Is Not Causation

Two events occurring together does not mean one caused the other. This error is so common it has its own Latin name: cum hoc ergo propter hoc. With this fallacy, we mistake the proximity of events for their causal relationship.

Ice cream sales rise in summer. So do drowning deaths. The correct interpretation is not that ice cream kills — both are caused by warm weather. The confounding variable hides in plain sight for those who stop at surface correlations.

Robust causal claims require controlled experiments, elimination of confounders, and replication across independent datasets.

PROPOSITION

"That which can be asserted without evidence can be dismissed without evidence."

— Christopher Hitchens

The Hitchens Razor

A principle as sharp as any logical instrument. Apply it freely. Apply it mercilessly. Apply it first to yourself.

COGNITIVE BIAS

Confirmation Bias: The Invisible Filter

We seek information that confirms what we already believe. We dismiss contradicting evidence as unreliable. We remember supportive data and forget counter-examples. Confirmation bias is not a sign of stupidity — it is a feature of all human cognition. The question is whether you have installed a corrective.

The corrective is actively seeking disconfirmation. Before accepting evidence that supports your view, ask: what would count as evidence against it? If no such evidence is possible, your belief is not rational — it is a definition.

FALLACIES

Ad Hominem: When Character Replaces Argument

Attacking the person making an argument rather than the argument itself is a logical fallacy so pervasive it requires constant vigilance. Even deeply flawed individuals can state true things. Even paragons can err.

Evaluate the argument. Then, separately if at all, consider its source.

"The first principle is that you must not fool yourself — and you are the easiest person to fool."

— Richard Feynman
CRITICAL THINKING

Sunk Cost Fallacy

Past investment — time, money, emotion — is irrelevant to whether you should continue. The only question is: given the current state, is further investment rational? History is not an obligation.

REASONING

Falsifiability

Karl Popper's criterion separates science from pseudo-science. A hypothesis is scientific only if it makes predictions that could, in principle, be proven false. Unfalsifiable beliefs are metaphysics, not knowledge.

DISCOURSE

Modus Ponens

If P, then Q. P is true. Therefore Q. The oldest valid argument form. Simple. Devastating. Most arguments that claim this structure do not actually have it — inspect the premises first.