Evidence and sources

Every important claim on the site carries one of four labels.

[Verified] – we have read the source; it is named next to the claim.
[Inference] – drawn from a source, but the source does not say it directly.
[Expert judgement] – the author’s view; no study of its own yet.
[Needs checking] – no reliable source found yet.

Correlation is never written as cause. This table covers the general claims and the English lessons. The full table in Vietnamese covers every course.

Claim	Label	Source
Parenting for Lifelong Health – young children: randomised trial with 296 caregivers in South Africa; observed positive parenting +39% after 4–5 months, +24% after 17 months	[Verified]	Ward et al. 2019
PLH materials on the WHO website use the CC BY-NC-ND 4.0 licence (no derivatives), so we only link to them	[Verified]	WHO
Social and emotional learning: meta-analysis of 424 studies in 53 countries, mostly in schools	[Verified]	Cipriano et al. 2023
Stories that praise a character for telling the truth made children aged 3–7 confess more; stories that threaten punishment did not work better	[Verified]	Lee et al. 2014
“Growth mindset” interventions have very small effects (d ≈ 0.02–0.05)	[Verified]	Macnamara & Burgoyne 2023
Whole-school mindfulness (MYRIAD, 8,376 students) did not beat the comparison group after one year	[Verified]	Kuyken et al. 2022
Age-based activities to build executive function skills	[Verified]	Harvard Center on the Developing Child
Reach Up materials use the CC BY-NC-SA 4.0 licence	[Verified]	Reach Up
Young children can drown in a few inches of water at home; keep them within arm’s reach	[Verified]	CPSC
Morning chart and “Robot” game in Week 1 were designed by daynentang.com; no study of their own	[Expert judgement]	Design or judgement of daynentang.com
Toilet-paper-tube test is a quick home check for small parts; it does not replace toy safety standards	[Expert judgement]	Design or judgement of daynentang.com
Vietnam child protection hotline 111: free, 24/7	[Verified]	tongdai111.vn
Ngày Mai hotline 096 306 1414: 13:00–20:30, Wednesday to Sunday	[Verified]	duongdaynongngaymai.vn

Checked 28 October 2026. Found an error? We correct it publicly in the change log on the About page.