In this question I would like to ask you about material showing the uses (or occurrences) of mathematics in the everyday world. The aim is to encourage with it a group of young undergraduate mathematics students, and for this reason I am looking for:
Material rich in pictures, animations, interactive applets perhaps, which may attract the attention of those young students, and useful for conferences and other activities.
Pedagogical material: showing the power of mathematics perhaps without having studied the topic rigorously.
Material dealing with advanced mathematics: the real challenge is to show the importance of advanced mathematics, because basic mathematics examples are abundant and overused.
Of course, besides material, any idea or suggestion is welcomed.
One source of free interactive demos is the Wolfram Demonstrations Project.
You need to download the freely available Wolfram CDF Player if you don't have Mathematica.
For very nice graphs, try the Desmos Graphing Calculator. The output looks really nice.
See for instance an interactive example of drawing lines.
Try also What's Happening in the Mathematical Sciences and Mathematical Moments, both from the AMS.