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• • Future & Speculative
  • fermi-paradox
  • seti
  • astrobiology
  • drake-equation
  • probability
  If the universe is so big, where is everybody?
• • Future & Speculative
  • fusion
  • energy
  • nif
  • forecasting
  • clean-energy
  Will fusion power be on the electric grid by 2035?
• • Mind & Philosophy
  • free-will
  • neuroscience
  • libet
  • readiness-potential
  • consciousness
  Do brain signals show our decisions are made before we're aware of them?
• • Mind & Philosophy
  • consciousness
  • ai
  • llms
  • philosophy-of-mind
  • ethics
  Could today's AI chatbots be conscious?
• • Mysteries
  • pyramids
  • ancient-egypt
  • archaeology
  • nile
  • engineering-history
  How did the ancient Egyptians move the stones to build the pyramids?
• • History & Society
  • social-media
  • adolescents
  • mental-health
  • causal-inference
  • policy
  Did smartphones and social media cause the rise in teen depression and anxiety?
• • History & Society
  • archaeology
  • peopling-of-americas
  • radiocarbon
  • osl-dating
  • white-sands
  Were humans in North America during the last Ice Age?
• • Engineering
  • solar
  • perovskite
  • tandem-cells
  • photovoltaics
  • energy-transition
  Will perovskite-silicon tandem solar panels replace standard silicon panels?
• • Engineering
  • autonomous-vehicles
  • road-safety
  • waymo
  • statistics
  • transportation
  Are robotaxis already safer than human drivers?
• • Earth & Climate
  • amoc
  • tipping-points
  • ocean-circulation
  • climate-risk
  • gulf-stream
  Is the Atlantic Ocean's major current system heading for collapse?
• • Physics & Space
  • cosmology
  • dark-energy
  • desi
  • bao
  • supernovae
  Is dark energy changing over time?
• • Physics & Space
  • cosmology
  • hubble-constant
  • jwst
  • cmb
  • lambdacdm
  Is the Hubble tension a sign of new physics, or a measurement error?
• • Technology & AI
  • synthetic-data
  • model-collapse
  • training-data
  • llms
  • ai-safety
  Will AI trained on AI-generated content degrade over time?
• • Technology & AI
  • llms
  • scaling-laws
  • test-time-compute
  • reasoning
  • inference
  Is letting AI 'think longer' better than building bigger AI models?
• • Mysteries
  • uap
  • ufos
  • aaro
  • nasa
  • extraterrestrial
  Are UFOs/UAP evidence of alien technology?
• • Earth & Climate
  • global-warming
  • aerosols
  • clouds
  • albedo
  • climate-sensitivity
  Why were 2023–2024 so unexpectedly hot, and is warming accelerating?
• • Life & Health
  • glp-1
  • semaglutide
  • obesity
  • cardiology
  • rct
  Do GLP-1 drugs like semaglutide protect the heart even in people without diabetes?
• • Life & Health
  • alcohol
  • epidemiology
  • mortality
  • meta-analysis
  • nutrition
  Is moderate drinking good for you?
• • Economics
  • cash-transfers
  • development-economics
  • rct
  • consumption
  • kenya
  Do unconditional cash transfers raise household consumption?
• • Economics
  • generative-ai
  • productivity
  • labor
  • field-experiments
  • rct
  Does generative AI actually make workers more productive?

Closed questions

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