Mining carts, yes, precisely. Computer? As in thinker, someone who determines by calculation? In that sense, certainly. In the sense of your form of communicating devices, not so much.

And yes, quite. *can't you just hear him smiling? it perfectly illuminates his perfect face, you know* Give me time. I'll very likely think of something else if I'm here long enough.

Yourself? What's your favourite broad sweep of generalization?