civil-engineering

The largest dam changes depending on whether you rank by height, reservoir, concrete volume, or hydroelectric output. Here is the science behind each record.

The longest bridge on Earth runs for 164 kilometres — roughly the distance from London to Birmingham — carrying high-speed trains across the rice paddies and rivers of eastern China. The Danyang–Kunshan Grand Bridge is so long that calling it a 'bridge' almost understates it; it is an elevated railway the length of a small country. But the real engineering drama lies elsewhere: in the bridges that span the widest single gaps without touching the ground.

Building a skyscraper means solving physics problems at enormous scale — wind, weight, sway, and the challenge of going higher.

Bridges carry millions of people safely every day. Here's the remarkable engineering behind why they hold.