I will be working with a group of high school students on introductory modern physics. They've studied classical physics, chemistry and differential calculus. Some will be taking integral calculus concurrently. We work from Weidner and Sells Elementary Modern Physics. I do not see much I can do to collect data with them, and so am looking for sources of data they can work with. They will be able to do basic calculations with relativistic momentum and energy (as well as the Lorentz transformations). Any suggestions would be very welcome.