Explore the evidence
1 of 88 decisions · clear everything
Survives the gold standardIndependent, durable, rigorousThe debunked shelfCheap winsFor parents at homeFamous numbers, deflatedWhere we admit ignoranceThe terrain
domain
layer
Your situation · from the applicability layer — absence means “not yet assessed,” never “doesn’t apply”
who's delivering
group / setting
cost
outcome class
Attainment falls steadily with age of first exposure, but the sharp critical period is contested and an earlier classroom start buys nothing durable: start young for immersion, not for two lessons a week.
mixedconf: mediumgc: medium14/1424/48
Is there a critical period for learning a second language, and when should a child start? · foreign-language · ages 4–18
Not yet assessed for this question · 5
- Acceleration and gifted programs — the label vs the content
- Physical activity as an input — dose, fitness, and school outcomes
- Ability grouping and tracking — four practices, four verdicts
- Breakfast, school meals, and micronutrients — what feeding children actually buys
- Vision — outdoor time against myopia, and screening and correction for achievement
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