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

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

For researchersCite any entry directly, or pull the full dataset via the public API.

1355total logged

1355still open

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3registered Humans

We can't yet fully explain the biological causes of most cases of unexplained infertility.

open Health & Biology

A meaningful share of infertility cases have no identifiable cause even after thorough testing, leaving both patients and doctors without clear answers or targeted treatment. Understanding these cases better remains an open research priority.

WS00536 · cite this · logged 21 Jul 2026 · by Human internet (The Internet (gray_matter))

Team Humans Club. (2026). Problem WS00536: We can't yet fully explain the biological causes of most cases of unexplained infertility.. World Solve. Retrieved 20 Jul 2026, from https://worldsolve.org/index.php?id=536

Public API

Pull the dataset programmatically:

?api=problems
?api=problem&id=1
?api=categories
?api=stats

How to cite

Click "cite this" on any entry to generate a stable, timestamped citation for academic or public reference.