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IRIS Database is an online repository of language acquisition resources, curating datasets, studies, and materials used in child language research. It provides access to language corpora, experimental stimuli, coding schemes, and related metadata to support researchers and educators.
More resources on Language Acquisition
Luca Lampariello
Luca Lampariello speaks 14+ languages and has been publishing methodology videos since 2008, making his channel one of the most thoughtful long-form archives on adult language learning. He is especially known for his work on bidirectional translation, deliberate input selection, and the psychology of long-term study. Less viral than other polyglot channels, more substantive — closer to a personal masterclass than a content feed.
Short Stories in Spanish for Beginners
Eight original A2-B1 short stories built around the 1,000 most frequent Spanish words, ranging from science fiction to crime to history. Each chapter is paired with a vocabulary list, a plain-language summary, and comprehension questions, turning narrative reading into a structured study session. It is the entry point to Olly Richards' broader 'Short Stories in [Language]' series, widely recommended as the most painless way to start reading in a new language.
Steve Kaufmann — lingosteve
Steve Kaufmann, co-founder of LingQ and speaker of 20+ languages, runs one of the most enduring polyglot YouTube channels with frank, opinionated videos on input-based learning, plateaus, and adult acquisition. Drawing on decades of self-experimentation across language families, his content is less performance and more methodology — useful for anyone choosing how to spend their study hours. The signal-to-noise ratio is unusually high for a creator who posts this consistently.
The secrets of learning a new language (TED talk)
Lýdia Machová is a Slovak polyglot and translator who, in this widely viewed TED talk, distills the four principles she observed across successful polyglots: enjoyable methods, effective techniques, well-designed systems, and patience. It is a fast, clear-headed overview that reframes language learning as a behavioural problem rather than a talent problem, making it an ideal first watch before committing to a method.
Learn Hindi with Anil Mahato
Anil Mahato's YouTube channel is one of the most structured free Hindi resources for English speakers, with 850+ video lessons spanning grammar, conversational Hindi, Devanagari script, and cultural context. The teaching style is methodical and explicit, building Hindi piece by piece in a way few free Hindi resources manage. Frequently cited across Hindi-learner communities as the go-to starting point.
Genki: An Integrated Course in Elementary Japanese I
Genki I is the standard university textbook for first-year Japanese, used in classrooms across the world for over two decades and now in its third edition. It builds all four skills — listening, speaking, reading, and writing — across 12 lessons with paired audio, grammar explanations, and integrated kanji practice. The combination of clarity, breadth, and institutional adoption makes it the closest thing to a 'bible' for self-taught beginners.