Two interactive demos: one for the science half (Monte Carlo), one for the database half (sharded parallel queries). Open them full-screen and show them live in class.
▶ Open the Interactive SlidesThrow random darts at a circle-in-a-square and watch π emerge from pure randomness. A "cores" slider splits the darts across workers — embarrassingly parallel, near-perfect speedup.
Watch a query fan out across 5 shared-nothing shards in parallel, then merge. Flip the shard key to a bad one and see a hot shard wreck the speedup — the CTO's real-world framing.
No installs, no compilers — these run in any modern browser. They're the two big applications of Unit V: simulating the physical world, and querying data too big for one machine.