🔧 How Things Work
Five micro-lessons · about 33 minutes in total
Fridges, microwaves, motors, batteries and flight — everyday engineering. Five lessons, about 33 minutes in total — read one at a time; each stands alone.
The five lessons
1. The Fridge: A Heat Courier
Cooling is not removing cold — it is pumping heat out, and the same trick can heat a house.
2. The Microwave Oven
Non-radioactive light that shakes water hot — and the myths that never die.
3. Motors and Generators: One Trick, Two Directions
Coils and magnets, why a fan is also a power plant, and how EVs recharge on hills.
4. Batteries: Slow Chemistry, Stored Sunshine
Li-ion shuttles ions, electrons detour through your phone — and why fuel still wins by weight.
5. How Planes Fly
Bent air and pressure differ — two names for one deal the wing makes with the sky.
Try it live
Further reading
Three real books on this track, from the Open Library catalogue — follow the links for libraries, previews and borrow options.
The research
The most-cited Crossref-indexed papers matching the topic — a window into how professionals actually study it.
- Matplotlib: A 2D Graphics Environment — Hunter (2007), cited 37,741 times
- A New Approach to Linear Filtering and Prediction Problems — Kalman (1960), cited 24,254 times
- The empirical mode decomposition and the Hilbert spectrum for nonlinear and non-stationary time series analysis — Huang (1998), cited 20,334 times


