Yesterday, I came home from work early and had a bit of time to play with my kids. My eldest (10) and her brother (8) were playing a yo-yo. My daughter already got the hang of it, while my boy couldn't seem to make the yo-yo go up in a snap. As I watched them play, I saw my boy getting more and more frustrated with each failed attempt. Finally, he turned to me with his face all tearful and anguished with disappointment. I gestured for him to come over. As I was hugging him, he said to me in a...