How does cold milk disperse when it is dripped into hot coffee? Even the fastest supercomputers are unable to perform the ...

[Eric] needed a project for his digital logic design class ... Instead, it uses individual logic chips. The lock senses the knocks with a piezo, just like every other build we’ve seen.

Somehow, though, that doesn’t seem as much fun as virtually connecting 7400 chips together. Don’t ask us why. There’s also a link to an impressive open source web-based logic simulator.