i don't know how you pronounce elsevier. of cognitive elsevier.ment. doctor elsevier. journal of cognitive devel0|uhent. doctor elsevier. journal of cognitive devel0|uh ,1t. doctor elsevier. journal of cognitive devel0|uh , nicholas doctor elsevier. journal of cognitive devel0|uh , nicholas knowles,r called, uh, nicholas knowles, and he's done this research study. a proper study in study. so it's a proper study in a journal . and a proper medical journal. and he's when little he's saying that when little children, the ones he's saying that when little childr< seven, the ones he's saying that when little childreseven, you the ones he's saying that when little childreseven, you givee ones he's saying that when little childr< seven, you give them; under seven, you give them a present. don't generally present. they don't generally say you. and this is say thank you. and this is largely been interpreted them largely been interpreted as them just ungrateful . just being really ungrateful. and scientific and this science, scientific study is saying that'