moms and dads went up and down, sometimes turning into the school to bring some forgotten thing to one of the pupils. however, the authors point out that stress can affect learning. but go up a half size, it runs bit small i had to exchange it for a bigger size. i cannot stress enough how important form is while performing an exercise. please allow up to 36 hours. this guy flew in last night and gave me quite a surprise. you will have to adjust the number of rows/columns to achieve the right order. 