Lesson Ideas&Starters and inquiry
Session 1: Inspiration and Inquiry
3. Wave Transformations 
How your ear hears (first 5m10 for IB trig classes, first 2m25 as an intro to Tri, or from 3m to 5m10 as a fractions starter!) and the amazing world of 
Waves, how they define physical realities. Here's another experiment you can do at home to produce waves (fizzics.org - watch from 2m48 to 3m15).
4. Audacity download. Dog Whistles and Varying Frequency and Wave Form website provide interesting sound files for students to analayse. Use Autograph to Model the wave. This use of audacity comes from Richard Wade - try this ready to go lesson resource with your classes: Trig Modelling - Sound
5. Twitter, Facebook, Edmodo, Geogebratube and Youtube channel recommendations below to get you started:
7. Normal Distribution and the 2008 Financial Crisis
8. Percentage Investments - Geogebra help videos below:
10. UK house prices - Piecewise Functions Using Autograph
Lots of sources of exploration ideas (TED videos, podcasts, websites etc.) are listed on the TSM2014 Bringing the Outside World In page.