Free 4D Earth Book

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The discussion centers on a free PDF book titled "Elsewhere: Everyday Life On A Hypergeometric Earth," which explores the concept of a four-dimensional Earth. It provides an accessible introduction to hyperdimensional geometry, focusing on intuitive concepts rather than complex mathematics, with detailed illustrations to aid understanding. The book is designed for readers interested in theoretical physics and geometry without requiring advanced mathematical knowledge. It aims to stimulate curiosity about the implications of additional spatial dimensions on everyday life. Overall, it serves as a resource for those looking to explore the fascinating idea of a four-dimensional reality.
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Thread 'Any plausible non chemical rocket based space launch system on Earth?'

I write an sf story, and an important part is an attack on a big, expensive space launch system on Earth. But what system could be built without pretty much magic? Looks like space elevator couldnt be made even from carbon nanotubes. Maybe a space cannon, that could launch cargo to space with suborbital speed, then lifted further with nanotube cables and a space station below GEO orbit?
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