High-quality early child development initiatives are expensive. However, careful analysis of the returns on investment for such initiatives establishes that, from the government's perspective, the initiatives all but pay for themselves. The explanation for this is twofold. First, early childhood interventions enhance adult employability and earnings of program participants. This generates $8.2 ...

let $g$ be a non-abelian group of order $p^n$‎, ‎where $nleq 5$ in which $g$ is not extra special of order $p^5$‎. ‎in this paper we determine the maximal size of subsets $x$ of $g$‎ ‎with the property that $xyneq yx$ for any $x,y$ in $x$ with‎ ‎$xneq y$‎.