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[Tom Joad]

Re: Martindale's reference

It takes only one like Charlie to give a website veracity. I'll second his suggestion by saying that I've been using Martindale's for some time.

Wolfram Alpha is another website I use but I have a subscription. There's no end to the mathematics and computer modeling you can do, but there's much more. You can find things like climate data for a weather station on a specified day, properties of elements, and there's all the physics you need. Worringly, one can find solutions to many math, stoichiometry, and physics problems. I use Martindale's along with Wolfram Alpha.

So you're a parent worried about your children's education? Send them to Khan Academy. They give clear, accurate explanations.