Engineering

How the built world actually gets made.

Videos

• So You Want to Build a Tunnel… (Video) — Practical Engineering on how tunnels actually get dug (cut-and-cover, boring machines, sequential excavation) and how the ground itself decides which method you’re allowed to use.

Sites

Bartosz Ciechanowski (Website) — legendary interactive explainers where every diagram is a live model you drag, spin, and take apart until the thing finally clicks.

• Mechanical Watch (Interactive) — the mainspring, escapement, and automatic winding of a watch, built up piece by piece.
• GPS (Interactive) — how trilateration, satellite orbits, and signal timing put a dot on your map.