World Solve

Almost all current reusable rocket technology is built for missions close to Earth, while deep space missions still rely on expensive, largely disposable hardware. Extending reusability further out could reshape space exploration economics.

Evidence suggests Mars once had liquid water, a key ingredient for life, but no mission has yet found conclusive proof of past or present microbes. Answering this remains one of planetary science's biggest open questions.

Precious samples brought back from the Moon or asteroids need to remain scientifically useful for generations of future researchers. Long-term sample preservation technology hasn't fully caught up with mission ambitions.

Ocean currents regulate weather and temperature worldwide, and small changes could have outsized global effects. Current climate models still can't predict these shifts with the precision policymakers need.

Astronauts on extended missions lose bone density and muscle mass faster than doctors can fully explain or prevent. Understanding this better is essential before any mission lasting years, like a trip to Mars.

Thousands of dead satellites and fragments now circle the planet, and a single collision can create thousands more pieces of debris. Left unmanaged, this could eventually make some orbits too dangerous to use safely.

Shipwrecks and sunken settlements often hold historically valuable artifacts that are vulnerable to looting due to weak or inconsistent international protection. A stronger shared framework remains unbuilt.

Valuable datasets from completed research projects are sometimes lost entirely once funding and staff move on, wasting years of prior work. A shared system for preserving this data long-term remains underdeveloped.

Enormous amounts of human knowledge and art remain physically locked inside buildings that most of the world's population will never get to visit in person. Making this content genuinely accessible remotely remains incomplete.

Thousands of victims from past wars and disasters remain unidentified, leaving families without closure decades later. Better, cheaper identification methods could resolve many of these long-standing cases.

Much of humanity's cultural knowledge lives only in memory, passed down verbally, and disappears permanently when the last person who remembers it dies. Systematic preservation efforts remain underfunded and incomplete.

Turbulent flow, like water rushing through a pipe or air moving over a wing, is notoriously hard to describe with exact mathematics. A complete theory would improve everything from weather prediction to aircraft design.

We have very good approximations, but no exact formula exists that perfectly predicts the count of primes below a chosen number. Improving this approximation remains an active and important area of research.

This idea, part of an old and famous conjecture, has held true in every case checked so far but has never been proven true for all numbers without exception.

Finding the shortest possible route visiting a long list of locations becomes exponentially harder as the list grows, and no fully efficient general solution exists. Logistics, chip design, and delivery networks all run into this limit.

Twin primes are pairs of prime numbers that differ by only two, and mathematicians strongly suspect there are infinitely many, but nobody has proven it. This remains one of number theory's oldest open questions.

Conservation efforts often focus on species useful or appealing to humans, leaving the ethical status of less charismatic species less clear. Whether all species deserve equal protection regardless of usefulness remains unresolved.

International law sets minimum obligations toward refugees, but whether wealthier nations have a deeper moral duty beyond the legal minimum remains a genuinely contested ethical question.

Every major technology carries some risk of misuse or unintended harm, but there's no agreed standard for how much risk is acceptable before restricting or slowing development.

Poverty, trauma, and social conditions can heavily influence behavior, but there's no settled agreement on how much this should reduce someone's responsibility for their actions.