Dr. Bob is a Seattle blogger who writes about medicine, ethics, and things spiritual. Recently he wrote a piece about concrete technology as applied to the Tacoma Narrows bridge.
Concrete is ubiquitous and is fascinating stuff, essentially a synthetic rock. Its the most common but by no means the only composite material we use these days.
One of the nice things about being a lawyer (yes, there are some!) is the chance to learn about all kinds of things, without having to learn them well enough to do them. Having tried several cases about concrete, I've learned quite a bit about it.
The bridge thing, however, is on a different scale.
Dr. Bob's piece is worth a read, and not too technical to understand.