mr. gerard, i'm playing. man: that's fine. that's why we come outside--to play.lay, matt? hendrick: biologically and physiologically, there are differences, and we need to appreciate and value them. for example, research has shown that the physical activity needs of most boys appear to be different from those of most girls. pile. uh-huh! he's going to-- oh, yeah! ooh! hendrick: like it or not, boys are more likely than girls to engage in more rough-and-tumble play. [children shouting indistinctly] boy: stop it! hendrick: and, more times than not, boys tend to be more overtly aggressive than girls are. [children shouting indistinctly] hendrick: although all children need opportunities for vigorous physical activity, boys do seem to need it specially. their play requires large, sturdy equipment, plenty of space... child: i want you to push me. and a teacher who genuinely welcomes such activity rather than regarding it as a threat to her ability to control the children. as i said, sometimes it can be a real tightrope walk trying to raise or teach a whole child, and