I can't speak for chemistry or physics, but that must be an incredibly poor mathematics program? I can't remember seeing anything past calc on yahoo answers and those answers were almost always wrong, or correct but with wrong explanations.
I love how Yahoo Answers is basically a crowd-sourced unit conversion engine that makes lots of mistakes. I notice it show up a lot below the Google-supplied unit conversion I'm actually seeking.
Ah, nice! Only downside is that it doesn't support highlighting certain results. For example, Google Search Filter highlights Wikipedia and StackExchange results for, while removing cruft like Yahoo Answers.