
How the brain retains information — and how to design content that sticks.

Understanding the architecture of human memory — and why some things stick while others fade.

Working memory is your brain's scratchpad — it holds about 4 items for roughly 20 seconds. Long-term memory is the warehouse — virtually unlimited, but getting information there requires effort.

Ebbinghaus discovered that without reinforcement, learners lose the majority of new information within a day. But strategic review intervals can flatten the curve dramatically.
The process of converting sensory input into a form that can be stored in memory. Deeper processing leads to stronger encoding.
The maintenance of encoded information over time. Consolidation during sleep plays a critical role in strengthening stored memories.
The process of accessing stored information when needed. Retrieval practice is one of the most powerful learning strategies known.
The gradual fading of memory traces over time when not reinforced. The forgetting curve shows how rapidly this occurs without review.
Why too much information at once kills learning — and how to manage the load.

Cognitive load theory distinguishes between three types of mental demand. Good design minimizes the bad load and maximizes the good.
This is the inherent difficulty of the material. Teaching quantum physics has higher intrinsic load than teaching basic addition. You can't eliminate it, but you can manage it by breaking complex topics into smaller, sequential chunks — a technique called element interactivity reduction.
This is the cognitive effort wasted on poor design — cluttered layouts, confusing navigation, irrelevant graphics, or instructions that split attention. This is the load instructional designers have the most control over. Eliminate it ruthlessly.
This is the productive mental effort that builds schemas and deepens understanding. Activities like comparing examples, self-explaining, and elaborative rehearsal all increase germane load. This is the load you want to maximize.
Evidence-based techniques that dramatically improve retention and transfer.

The act of pulling information from memory — not putting it in — is what strengthens learning. Every time you retrieve, the memory trace gets stronger.
Click each section to learn about the evidence behind these high-impact learning strategies.
Testing yourself on material is far more effective than re-studying it. Flashcards, practice quizzes, and brain dumps all count as retrieval practice.
Reviewing material at increasing intervals (1 day, 3 days, 7 days, 14 days) dramatically improves long-term retention compared to massed practice.
Mixing different topics or problem types during study leads to better discrimination and transfer than blocking (studying one topic at a time).
Asking "how" and "why" questions about the material, connecting it to what you already know, creates richer memory traces and deeper understanding.
Combining verbal and visual information creates two separate memory traces, making retrieval more likely. Words + pictures > words alone.
You've completed The Science of Learning. Apply these principles to design content that truly sticks.
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