World Solve

Zoning, housing, and infrastructure decisions are sometimes controlled by higher levels of government that move far slower than the pace of local growth. This mismatch leaves cities struggling to manage problems they can see coming but can't legally address.

Developing countries often pay significantly higher interest rates for clean energy projects than wealthier nations, slowing their transition away from fossil fuels. Fairer, more accessible financing remains a major unresolved barrier.

High childcare costs push many parents, disproportionately mothers, out of the workforce entirely or into reduced hours. Making quality childcare broadly affordable remains an unresolved economic and social policy gap.

Some products, like social media or certain foods, are deliberately designed to be highly engaging or addictive, raising questions about the maker's moral responsibility for resulting harm.

Remittances sent to Indonesia from diaspora communities abroad are subject to high transfer fees, reducing the effective value delivered to recipient households who depend on this income.

High student debt loads are pushing back decisions like buying a home or starting a family for many young adults. Rebalancing the cost of education against its long-term benefits remains a persistent economic problem.

High-interest, exploitative loans continue to target people with limited financial options, often trapping them in cycles of debt. Stronger, consistently enforced protections against this remain incomplete in many regions.

As climate disasters become more frequent, insurance premiums in high-risk areas are rising sharply or disappearing altogether, leaving residents financially exposed. A sustainable model for insuring these regions remains unresolved.

Basic knowledge of how to respond to earthquakes, floods, or fires can save lives, yet many school systems don't teach it consistently. Making this training universal remains a low-cost, high-impact gap.

Countries with opt-out organ donation systems tend to have far higher donation rates, saving more lives, but implementing this fairly and ethically worldwide remains politically and culturally difficult.

Search results are ranked mostly by popularity and relevance signals, not by actual accuracy, letting false but engaging content rise to the top. A better system needs to weigh truthfulness, not just engagement.

These particles carry more energy than anything we can produce on Earth, and we still don't know exactly what cosmic event launches them our way. Identifying the source could reveal entirely new astrophysical processes.

This weaker cousin of Goldbach's Conjecture illustrates how even modest-sounding claims about primes can remain unproven for centuries. It highlights how little we still understand about the raw arithmetic of prime numbers.

Sphere-packing problems are solved for a few specific dimensions, but the general pattern across all possible dimensions remains unknown. This affects fields ranging from error-correcting codes to theoretical physics.

This question, closely related to the once-open Poincaré Conjecture, has been resolved in three dimensions but opens further mysteries in higher-dimensional analogues. Exploring these generalizations remains an active area of topology.

The famous four-color theorem was resolved for flat maps, but generalizing the problem to more complex or higher-dimensional surfaces remains unsettled in several cases. This continues to be explored in graph theory and topology.

While the standard cube's maximum was determined through massive computation, generalized versions with more dimensions or larger sizes remain computationally and theoretically unresolved. This connects group theory with combinatorial optimization.

Formulas exist for degrees up to four, but general algebraic solutions for higher degrees don't exist in the same closed form, leaving open questions about alternative methods. This shapes ongoing research in both pure and computational algebra.

Random graph theory offers probabilistic guarantees for many structures, but proving certainty, rather than high likelihood, for every possible case remains an unresolved and active research area. This affects our understanding of networks in biology, technology, and social systems.

Even legally protected forests are frequently logged illegally due to weak enforcement and high demand for timber, undermining conservation efforts on paper. Stopping this in practice, not just in law, remains an unresolved global challenge.