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Use zoom.it to take photo and zoom in & pan around.  Could be a great tool for discussions or even writing prompts.

zoom from micro to macro

SoundNote is the best way to take notes on your iPad. It tracks what you type and draw while recording audio, so you'll never worry about missing an important detail. While playing back your recording, just tap a word; SoundNote will jump right to that point in the audio. Use SoundNote's powerful drawing tool for quick sketches. It's easy to edit them, too. Tap a drawing to select it, or tap twice to select an individual stroke. From there, you can drag it to wherever you want, or tap "Delete" to get rid of it. Use two fingers to zoom and scroll.

Wordles of numerous US Presidential State of the Union speeches.