Half-Life: Why the Last Bit Takes So Long to Go
An afternoon coffee still has an eighth of its caffeine in you the next morning. Anything that loses a constant proportion per period behaves this way — including skills and knowledge.
Concept
Half-Life
Hormesis: The Dose Decides Whether It Helps
Lifting weights tears muscle, and the tearing is the point. A small dose of something harmful can trigger a repair response that leaves you stronger — but only under two specific conditions.