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Learning science

How ELO ratings, spaced repetition, and the testing effect power better learning. Research-backed strategies from LearnClash.

Most learning apps skip the research. LearnClash builds on four decades of cognitive science: the testing effect (Roediger & Karpicke 2006) shows active recall beats re-reading by 50%, spaced repetition (Ebbinghaus 1885; FSRS 2023) multiplies long-term retention, and competitive skill-matching through ELO (Elo 1960) keeps learners in their flow state. These articles explain how each mechanism works and how LearnClash combines them into a single 3-minute-a-day routine.

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Science Facts Adults Still Get Wrong [3,829 Answers]
Learning science 17 min read

Science Facts Adults Still Get Wrong [3,829 Answers]

Science facts adults get wrong, from 3,829 first-try LearnClash quiz answers on 86 science questions: 62.5% right, and a wrong majority on 29 of them.

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The 20 Wrong Answers People Are Most Confident About
Learning science 13 min read

The 20 Wrong Answers People Are Most Confident About

Twenty wrong answers real quiz players picked most often, from 24,065 questions with first-encounter answers, exported July 2026. Seven outpolled the truth.

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Leitner System Explained [From Shoebox to 117,812 Cards]
Learning science 14 min read

Leitner System Explained [From Shoebox to 117,812 Cards]

Leitner system explained: the 1972 five-box original, a paper setup you can copy, and a 117,812-card census from LearnClash's live three-box SRS.

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Interleaving Practice: Feels Worse, Works Better [Data]
Learning science 12 min read

Interleaving Practice: Feels Worse, Works Better [Data]

Interleaving practice mixes related topics in one session. See the evidence, when it backfires, and what 444 real quiz duels show.

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Why We Threw Out the 1/3/7/21 Spaced Repetition Schedule [2026]
Learning science 11 min read

Why We Threw Out the 1/3/7/21 Spaced Repetition Schedule [2026]

We found no academic source for the 1/3/7/21 schedule. Here's what real SRS algorithms do, and the 3-stage system LearnClash built.

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ELO Matchmaking & Win Rates: Why Skill Matching Wins [2026]
Learning science 15 min read

ELO Matchmaking & Win Rates: Why Skill Matching Wins [2026]

ELO matchmaking pairs LearnClash duels by skill so each lands near the desirable-difficulty zone where retrieval becomes durable memory.

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LearnClash SRS: Review Rules and Retention in 3 Stages
Learning science 12 min read

LearnClash SRS: Review Rules and Retention in 3 Stages

How LearnClash uses seven- and ninety-day review waits, what happens after mistakes and why a mastery label does not measure retention.

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