World Solve

Postpartum depression affects many new parents, often going undiagnosed until it significantly affects their wellbeing and their child's early development. Better early prediction could allow support to begin before symptoms take hold.

Because rare diseases affect few patients, there's often little financial incentive for researchers or companies to develop treatments. Thousands of rare conditions remain effectively untreated as a direct result.

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.

Existing dementia treatments offer only modest, temporary relief from symptoms rather than meaningfully slowing the underlying disease. A real disease-modifying treatment remains one of medicine's most sought-after breakthroughs.

Once the tiny hair cells in the inner ear are damaged, human bodies can't naturally regrow them, making most hearing loss permanent. Cell regeneration therapies show early promise but remain far from mainstream treatment.

Genetic testing can reveal risk for serious inherited conditions, but cost and access limit it mostly to wealthier patients and countries. Broader affordability could catch preventable conditions far earlier for many more people.

Autoimmune arthritis causes the body's own immune system to damage joint tissue, leading to chronic pain and disability. Current treatments manage inflammation but don't address why the immune system attacks in the first place.

Blood donation shortages remain a recurring problem worldwide, especially during emergencies when demand spikes suddenly. Lab-grown blood could remove dependence on donor supply entirely, but the technology isn't yet practical at scale.

Tinnitus affects a significant portion of the population and can seriously impact quality of life, yet current treatments only manage symptoms rather than eliminate the underlying cause.

Unlike infectious diseases, cancer arises from a person's own cells mutating, making a universal vaccine far more complex to design. Progress exists for a few cancer types, but a broadly effective approach remains unsolved.

Rivers often flow through multiple countries, and disputes over how much water each country can use remain a persistent source of tension. A widely accepted, fair sharing framework remains unbuilt in many major river basins.

Algae blooms can quickly poison drinking water sources, sometimes going undetected until people or animals get sick. Faster, cheaper detection methods could prevent this from becoming a public health crisis.

Wave energy is abundant and largely untapped, but current technology to harness it reliably and affordably lags far behind wind and solar. Cracking this could add a major renewable source to the global energy mix.

In hot, dry climates, a significant portion of irrigation water is lost to evaporation before it ever reaches crop roots. Affordable ways to reduce this loss could ease water stress in agriculture-heavy dry regions.

Wetlands filter water and protect against flooding, but restoring one once it's been drained or built over is far harder than protecting it in the first place. Better restoration techniques remain limited and expensive.

Farms produce enormous amounts of leftover plant material that mostly gets burned or discarded rather than turned into usable energy. Affordable, small-scale conversion technology could turn this waste into a valuable resource.

Even advanced AI systems sometimes generate plausible-sounding but incorrect answers, and users often can't tell the difference without checking elsewhere. A dependable way to prevent this remains unsolved.

Modern prosthetic limbs can restore some movement, but most still can't let a person genuinely feel what they're touching. Restoring sensory feedback affordably remains a major unsolved bioengineering problem.

Old software often becomes unusable as operating systems and hardware change around it, forcing costly rewrites or abandonment. Designing for genuine long-term durability is rarely prioritized.

Sending money internationally is often slow, expensive, or restricted depending on where you live, despite living in a supposedly connected digital economy. A truly borderless payment system remains unbuilt.