A wild and crazy planet

One of the joys of SF is the opportunity to Think Big. Earth, as large as it is, pales in comparison with, say, a Dyson Sphere or a Nivenesque Ringworld. But within the limits of today's technology, we humans (some of us, anyway), continue to Think Big ...

As illustrated by this CNN article: Sky trains, super bridges: 8 of the world's most spectacular infrastructure projects. Whether or not you're impressed by every one of these projects, I defy you not to be taken with the 1000-ton tunnel-bor...