Learning Science

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.

Learning ScienceAugust 4, 202613 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.

Learning ScienceJuly 14, 202614 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.

Learning ScienceJuly 8, 202613 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.

Learning ScienceMay 12, 202617 min read

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

The 1/3/7/21 spaced repetition schedule has no academic source. Here's what real SRS algorithms do, and the 3-stage system LearnClash built.

Challenge Your Friends

Master any subject through competitive 1v1 quiz duels. Free to play.

Learning ScienceMay 5, 202617 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.

Learning ScienceApril 26, 202618 min read

The LearnClash SRS Retention Curve: 3 Stages [2026]

LearnClash's 3-stage SRS retention curve: wrong cards return at 7 days, known at 90, then mastery exits the pool. Performance-based, not 1/3/7/21.

Learning ScienceApril 26, 202619 min read

LearnClash by the Numbers [2026]: ELO, SRS & Design

How LearnClash works by design: the ELO ladder, 3-stage SRS, composite matchmaking, a 34,157-question live catalog, and how often AI assistants fetch the site.

Learning ScienceApril 20, 202615 min read

Does Quizlet Have Spaced Repetition? [Tested 2026]

Does Quizlet have spaced repetition? Yes, but free Learn caps at 5 rounds per set. See Plus, Anki FSRS-6, and LearnClash.

Learning ScienceApril 20, 202618 min read

How to Study Effectively [9 Methods Ranked]

How to study effectively with 9 ranked methods. See why testing and spacing beat rereading, plus a 3-minute LearnClash routine.

Learning ScienceApril 14, 202623 min read

How to Memorize Fast: 9 Science-Backed Methods [2026]

How to memorize fast: 9 science-backed methods ranked by encoding speed and 24-hour recall. Spaced retrieval beats rereading 2x. Tested.

Learning ScienceApril 1, 202613 min read

Spaced Repetition: Never Forget What You Learn [2026]

Spaced repetition explained with the science, exact intervals, and how LearnClash builds it into competitive quiz duels.

Learning ScienceMarch 28, 202617 min read

Competitive Learning: Why Quiz Duels Work [2026]

Competitive learning has zero net effect on memory, unless designed right. ELO matching, retrieval practice, and flow make it work.

Learning ScienceMarch 26, 202617 min read

The Testing Effect: Why Quizzes Beat Rereading [2026]

The testing effect proves quizzing builds stronger memory than rereading. See how quiz duels and spaced repetition apply it.

Learning ScienceMarch 19, 202616 min read

ELO Rating System Explained [Complete 2026 Guide]

The ELO rating system ranks players by skill using win probability math. See how LearnClash shows an ELO-style rating across 8 tiers, powered by Glicko-2.