Ever wonder how photographs magically appear on Polaroid pictures? Photojojo offers a simple explanation of how the process works:
[...] your instant camera ejects the picture in between two metal rollers. The rollers pinch the chemical packets on the bottom of your film, break them open, and spread the developer chemicals all over the surface of your image. [#]
They also have some other interesting “photo science” explanations here. For a more in-depth look, check out this HowStuffWorks article on instant cameras.
Ever wonder what actually happens between the time you press the shutter button on a DSLR and when the image shows up on the LCD screen? Canon made these two videos explaining how their DSLR cameras work and how they use CMOS sensors to turn photons into photos. You’ll probably find this pretty interesting if you’ve never learned about CMOS sensors before. For a more in-depth lesson, check out the sensor tutorial over on Cambridge in Colour.