Hyde has observed that children also suffer the consequences of exaggerated claims of gender difference -- for example, the widespread belief that boys are better than girls in math. However, according to her meta-analysis, boys and girls perform equally well in math until high school, at which point boys do gain a small advantage. That may not reflect biology as much as social expectations, many psychologists believe. For example, the original Teen Talk Barbie ™, before she was pulled from the market after consumer protest, said, "Math class is tough.