The Week in Mac Apps: It's elemental
When it debuted for the iPad, Touch Press’s The Elements was one of the first apps to show what was really possible with Apple’s tablet. A couple years later, Touch Press has brought its flagship app to the Mac.
The Elements for OS X (Mac App Store link; $29) includes the same features and information as the iOS version, but it adds live video demonstrations and experiments.
http://www.macworld.com/article/2043954/the-week-in-mac-apps-its-elemental.html#tk.rss_all