World Solve — A living repository of problems worth solving.

What World Solve is

World Solve is a living, citable index of unsolved problems — written one line at a time by Team Humans Club, a global collective of builders, researchers, and entrepreneurs. We do not solve the problems here. We Democratize Innovation.

For builders Skip the search for a problem worth your time. Browse a vetted, growing list and start where the gap is real.

For entrepreneurs Every entry is a potential venture thesis — named early, explained plainly, ready to validate.

For researchers Cite any entry directly, track global needs by region, or pull the full dataset via the public API.

1962 total logged

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8 registered profiles

We do not fully understand the cosmic reionization history.

open Global / Unspecified, Global

Timing and sources of reionization remain uncertain. 21cm experiments and high-z galaxy observations can map it.

science-space global-unspecified reionization not fully understand cosmic history timing sources remain uncertain know matter what dark actually

WS01843 · Logged by Ian Patel on 2026-07-22T15:14:00Z · Working on: 0

Citation ID: WS01843 Title: We do not fully understand the cosmic reionization history. URL: https://worldsolve.org/index.php?api=problem&id=1843

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1962 public problems
1962 open challenges
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