Last week I was working on small vocabulary books for our Dutch as a second language children. (meesterkurt.be)
Vocabulary size predicts comprehension, but learning new words is especially hard for students who come to school with small vocabularies or limited knowledge of English. (ascd.org)
According to researcher Dr Andreas Hahn (Vienna): «It has been known for some time that higher testosterone is linked to smaller vocabulary in children and that verbal fluency skills decrease in female - to - male transsexuals after testosterone treatment. (sciencedaily.com)