HN discussion of interesting technology demos for fifth graders: https://news.ycombinator.com/item?id=20069714
One popular suggestion was browser tools, showing how web sites can be modified.
Another great idea is showing screenshots of bugs in realistic games and how they can go wrong.
miniblog.
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I have a fondness for visible pixelation: pixel art, bitmap fonts, displays with large LEDs.
It's a medium that's distinctly technological. I can display high resolution photos or realistic graphics on a modern device, but it's less distinct. The medium doesn't affect the msg.