Last week we proudly celebrated the milestone of 5,000 Demonstrations. As each one is a separate program, this represents a huge collaborative software development.

And now, every Demonstration has its preview animation available on YouTube. Each has a unique soundtrack created with variations on a custom WolframTones selection.

Some facts and figures: over the last year, there have been nearly 14 million visits to all Demonstrations pages, with 3.5 million unique visitors to the main site. As stated in the previous blog post, Demonstrations have been viewed over 6 million times. Over 1 million notebooks have been downloaded using the Mathematica Player and over half a million source notebooks have been downloaded.

Here are the top Demonstration topics:

These are the top 18 Demonstrations over the last year, with over 10,000 downloads on average:

Operating an AC Three-Phase Induction Motor, by Harley H. Hartman

The Commutative Property of Multiplication, by Sarah Lichtblau

Periodicity of Euler Numbers in Modular Arithmetic by Oleksandr Pavlyk

Electric Fields for Three Point Charges, by S. M. Blinder

Learn Musical Notes, by Carlos Ylagan

Sine, Cosine, Tangent and the Unit Circle, by Eric Schulz

Brake Shoes, by Sándor Kabai

Laser Diffraction Pattern, by Roger Germundsson and Devendra Kapadia

Profit Maximization in Perfect Competition, by Fiona Maclachlan

Relation of Radius, Surface Area, and Volume of a Sphere, by Joe Bolte

Newton’s Law of Cooling, by Jeff Bryant

Square-Hole Drill in Three Dimensions, by Stan Wagon

Visualizing Atomic Orbitals, by Guenther Gsaller

Wave-Particle Duality in the Double-Slit Experiment, by S. M. Blinder

Solids of Revolution, by Abby Brown and MathematiClub

Amplitude Modulation, by Jakub Serych

Radial Engine, by Yu-Sung Chang

Expected Returns of the Dow Industrials, Fama-French Model, by Jeff Hamrick and Jason Cawley

Please help get us to 10,000 Demonstrations! If you’re not already a Demonstrations author, check out how to participate.