MEL Chemistry is an iOS app that allows users visualize molecules in 3D. You can rotate, zoom in and zoom out to see molecule structure in details. There is also an accompanying bench chemistry kit that looks like a perfect christmas present for young (and not so young) home scientists. WolframAlpha has been updated
Remember the Star Trek computer? It's finally happening--with Wolfram|Alpha. Building on 25 years of development led by Stephen Wolfram, Wolfram|Alpha has rapidly become the world's definitive source for instant expert knowledge and computation. Parts of Wolfram|Alpha are used in the Apple Siri Assistant; this app gives you access to the full power of the Wolfram|Alpha computational knowledge engine.