Best of the Web. Picked by our PhDs

Here is a fun, colorful, and highly visual way to understand and practice working with squares and square roots. And it doesn’t cost you a penny! You know, because money is the square root of all evil.

As we all know, terms with square root symbols in them are *ugly*. It’s nice to have a way to simplify those suckers, and maybe even eliminate those symbols altogether if we get lucky. Fingers crossed…

Let this site help you understand one of the most important formulas ever devised. That "*E* = *mc*^{2}" was a pretty good one, too, but the guy who came up with that was a little crazy-looking. Are we really sure he knew what he was talking about?

Tired of all those male voices narrating the algebra videos? Allow us to introduce you to Mathgirl, who will walk you through the process of multiplying and dividing radicals. And without all that nauseating testosterone.

The comments on this video say it all. If you’re getting stuck on the quadratic formula and need a little extra help to wrap your brain around it, this is where you’ll find it. Still, you should probably do a few light brain exercises first so you don’t pull anything.

This is part one of a two-part video on multiplying radicals. If you like this one, make sure to see the sequel. It isn’t as good as the original, but sequels rarely are. Yes, *The Matrix*, we're looking at you.

This helpful table shows you the square and square root of every single number between 1 and 100 for your quick and easy reference. They would have included an even bigger table, but it never would have fit through the kitchen doorway.

Solve square root problems to work your way up the ladder—from $100 to $1,000,000! Don’t bother holding your hands by the USB port waiting for the money to be dispensed, though. This is only for pretend.

The wizard in this game really, really wants you to solve all of these Pythagorean theorem problems. Please make him proud. He has little else to live for.

The Pythagorean theorem shows up in word problems all the time because of how applicable it is to real life situations. See all those triangles floating past your window right now? That’s what we were talking about.