The "ringworld" is a classic sci-fi concept. Imagine a self-sustaining artificial world that just so happens to be shaped like a giant ring. Sometimes it looks like a big generation ship. Other times it looks like a ring-shaped planet. What will you...
Imagine what happens if you combine these two things...
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And presto, the donut-Earth challenge. Let yourself be inspired to write a comment or even a story — we will publish the best results (or more likely all of them) in the upcoming issue of Tevun-Krus!
