"Let’s pretend I’ve decided to build a spice rack.

I’ve done small woodworking projects before, and I think I have a pretty good idea of what I need: some wood and a few basic tools: a tape measure, a saw, a level, and a hammer.

If I were going to build a whole house, rather than just a spice rack, I’d still need a tape measure, a saw, a level, and a hammer (among other things).

So I go to the hardware store to buy the tools, and I ask the sales clerk where I can find a hammer.

"A hammer?" he asks. "Nobody really buys hammers anymore. They’re kind of old fashioned."

Surprised at this development, I ask him why."

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