Title: I&#x27;ve been on a big math and physics kick lately and have started reading Feynman&#x27;s &quot;Six Easy Pieces&quot;.<p>It&#x27;s got me thinking - what software is out there that is kind of like a particle &#x2F; quantum physics sandbox? Any environments where you can start playing with things, such as particles and forces, with lots of graphics &#x2F; interactivity?<p>To put it another way - what are some of the best &#x27;software physics toys&#x27; that people have come across?<p>I&#x27;ve seen &#x27;The Powder Toy&#x27; (http:&#x2F;&#x2F;powdertoy.co.uk&#x2F;) and &#x27;Algodoo&#x27; (http:&#x2F;&#x2F;www.algodoo.com&#x2F;).  Algodoo seems to deal mainly with mechanics and The Powder Toy is extremely fun though not really meant to be realistic as such.<p>Anything like &#x27;The Powder Toy&#x27; but more in-depth?
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