Repository of problems worth solving
World Solve is a public institutional repository for identifying real unresolved problems across science, society, health, governance, economics, and local systems. Each entry is intended to be citable, inspectable, and actionable.
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4194Total
4194Open
0Solved
9Humans
open
Global / Unspecified, Global
Zero-day flaws are unknown weaknesses in software that attackers can exploit before a fix exists, and current detection methods still miss many of them until after damage is done. Finding these flaws proactively remains one of cybersecurity's hardest problems.
technology-computing
global-unspecified
cybersecurity
zero-day
software
attackers
don
have
reliable
way
detect
vulnerabilities
find
whether
philosophy-ethics
determine
resolved
agreed
open
Global / Unspecified, Global
Astronauts lose up to 1-2% of bone mass per month in microgravity despite daily intensive physical exercise regimes. Artificial gravity habitats or gene-targeted therapeutics are needed to enable multi-year interstellar trips.
health-biology
global-unspecified
bone
zero-gravity
muscle
atrophy
density
loss
lack
permanent
non-exercise
countermeasure
philosophy-ethics
whether
mathematics-logic
don
way
prevent
open
Global / Unspecified, Global
Hydrogen and oxygen boil off due to solar radiation in orbit, prohibiting long-duration storage for deep space stages. Advanced active cryocooling, sunshields, and zero-boil-off insulation technologies are required.
science-space
global-unspecified
boil
off
storage
cryogenic
liquid
propellants
rapidly
during
long-term
orbital
climate-environment
long
society-governance
safe
technologies
smallholder
open
Global / Unspecified, Global
3D-printing complex structural metal components in microgravity often results in porosity and micro-cracks. We need reliable thermal controls and melt-pool monitoring for zero-g metal and composite fabrication.
science-space
global-unspecified
microgravity
in-space
additive
manufacturing
limited
fluid
dynamics
alloy
defects
metal
health-biology
fibers
defect
optical
affordable
structural
open
Global / Unspecified, Global
Standard lithium-ion batteries lose efficiency and fail at sub-zero temperatures without dedicated thermal heaters. Development of solid-state or low-temperature tolerant electrolyte batteries is essential for planetary night survival.
science-space
global-unspecified
batteries
temperatures
lack
low-mass
high-capacity
suitable
extreme
cold
deep
space
climate-environment
haven
electric
recycling
solved
vehicle
open
Global / Unspecified, Global
ZBLAN optical fibers produced in space exhibit far lower light attenuation than Earth-made fibers, but manufacturing defect rates remain high. Microgravity fluid dynamics and draw-tower controls must be perfected.
science-space
global-unspecified
fibers
manufacturing
optical
microgravity
lack
precise
affordable
techniques
zero-defect
zblan
construction
housing
reducing
social-civic-problems
space
must
open
Global / Unspecified, Global
Permanently shadowed craters at the lunar poles reach -240°C, making metals and polymers brittle and prone to shattering. Special cryogenic-resistant alloys and thermal insulation jackets are required.
society-governance
global-unspecified
lunar
reach
permanent
night
regions
near
absolute
zero
causing
severe
industrial
scale
propellant
structural
long
lack
open
Global / Unspecified, Global
Without gravity, liquid fuels float randomly inside tanks, causing air bubbles to enter fuel pumps during orbital refilling. Scalable fluid-settling systems and bladderless zero-g fuel transfer ports must be built.
science-space
global-unspecified
transfer
in-orbit
propellant
between
moving
spacecraft
microgravity
unstable
fuel
gravity
haven
whether
climate-environment
make
philosophy-ethics
mathematics-logic
open
Global / Unspecified, Global
Solar panels provide zero power during the two-week lunar night, where temperatures drop to -130°C. Regenerative fuel cells and compact nuclear reactors tailored for long lunar nights are required.
climate-environment
global-unspecified
lunar
night
lack
autonomous
long-life
surface
energy
storage
14-day-long
operations
solar
science-space
power
small
businesses
open
Global / Unspecified, Global
Solar sails require ultra-thin, kilometer-wide polymer films that cannot be safely deployed without tangling or tearing. Zero-g robotic vapor deposition or automated truss deployment frames must be engineered.
climate-environment
global-unspecified
cannot
solar
sails
efficiently
manufacture
mega-scale
lightweight
orbit
require
ultra-thin
whether
africa
infrastructure
waste
mathematics-logic
battery
Municipal transport authorities lack upfront capital to purchase electric buses and build high-voltage charging depots, prolonging diesel air pollution.
climate-environment
asia
sri-lanka
air-pollution
electric
haven
transition-funded
fossil
fuel
bus
fleets
zero-emission
transit
networks
global-unspecified
whether
philosophy-ethics
mathematics-logic
open
Global / Unspecified, Global
This conjecture about the zeros of a specific complex function would, if proven, tighten our understanding of how primes are distributed among all integers. It's considered one of the most important unsolved problems in mathematics.
mathematics-logic
global-unspecified
proven
haven
riemann
hypothesis
predicts
exactly
building
blocks
prime
numbers
whether
know
every
possible
mathematical
resolved
open
Global / Unspecified, Global
Migrating decades-old databases to modern systems carries real risk of subtle data corruption or loss, and fully automated, zero-risk migration tools remain unavailable for many complex legacy systems. This keeps organizations tied to outdated, harder-to-maintain infrastructure.
technology-computing
global-unspecified
systems
legacy
databases
risk
data
loss
build
software
automatically
safely
society-governance
whether
mathematics-logic
climate-environment
philosophy-ethics
across
A persistent gap exists in realizing practical, scalable solutions for antibiotic-free recirculating aquaculture with zero nutrient discharge. Scientific understanding, engineering readiness and institutional capacity remain insufficient to translate promising concepts into durable impact under real-world constraints of cost, skills and governance.
society-governance
asia
nepal
antibiotic-free
recirculating
aquaculture
zero
nutrient
discharge
deployable
technologies
persistent
gap
solutions
systems
methods
scalable
practical
Current approaches to education and workforce systems preparing people for livelihoods in a net-zero economy either underperform under variable field conditions or generate externalities that undermine long-term sustainability and equity. Closing the gap requires coordinated advances in science, systems design and enabling institutions.
economics-resources
africa
kenya
systems
education
workforce
preparing
people
livelihoods
net-zero
economy
integrated
pathways
society-governance
climate-environment
technology-computing
enabling
under