The hottest Science Substack posts right now

And their main takeaways
Category
Top Science Topics

LNT is not quite the "No Repair" Model

Gordian Knot News • 139 implied HN points • 27 Jan 26
🔬 Science DNA repair Modeling Epidemiology
  1. Allowing proportional DNA repair doesn't save the Linear No‑Threshold (LNT) model, because if cancer mainly arises from closely spaced double‑strand breaks, risk does not track total dose alone and can grow faster than linearly.
  2. If repair takes time, higher dose rates increase the inventory of unrepaired double‑strand breaks and the probability of two breaks clustering rises roughly with the square (or higher power) of dose rate, producing a nonlinear (steeper) risk response.
  3. Biologically, single‑strand breaks are fixed with very high fidelity, but double‑strand breaks can be misrepaired by joining wrong ends; those misrepairs (especially paired or closely spaced DSBs) are the likely mechanism for radiation‑induced cancer, so dose rate and break clustering matter.

What's the deal with magnetic fields?

lcamtuf’s thing • 4897 implied HN points • 04 Feb 25
🔬 Science Physics Electromagnetism Electricity Materials
  1. Electric fields are easy to understand because they involve the forces between charged particles, like how magnets attract or repel each other. This basic concept helps explain how electricity works in circuits.
  2. Magnetic fields can be confusing because they seem separate from electric fields, but they are connected through the concept of relativity. When things move, their distances and timings can change, affecting how we see electric and magnetic effects.
  3. Understanding that moving charges create magnetic fields helps simplify the whole idea. It's all about how motion changes our perspective on distance and forces between charges.

AI keeps getting better at talking about consciousness

The Intrinsic Perspective • 13599 implied HN points • 13 Mar 24
🔬 Science AI Consciousness Philosophy Neurotechnology Biology
  1. Artificial Intelligence is advancing in discussing consciousness, raising questions about its implications
  2. There is a scientific imbalance between the understanding of creating AI and understanding consciousness
  3. Debates on AI consciousness highlight challenges in defining consciousness and its relation to AI capabilities

things will have to change

Never Met a Science • 188 implied HN points • 15 Jan 26
🔬 Science Social Science Artificial Intelligence Research Methods Institutional Reform Metascience
  1. AI is now powerful enough to reshape how research is produced, and academic institutions must adapt quickly or be overwhelmed by a flood of AI-assisted work.
  2. AI offers clear benefits like automated replication and more frequent updating of knowledge, but we need institutional safeguards about ownership, verification, and corporate control of the tools.
  3. The role of scholars should shift toward curating and filtering knowledge and maintaining deep expertise, supported by metascientific reforms that preserve epistemic authority and make inductive approaches credible.
Get a weekly roundup of the best Substack posts, by hacker news affinity:

Can we use alpha particle exposures to falsify LNT?

Gordian Knot News • 124 implied HN points • 29 Jan 26
🔬 Science Radiation Biology Epidemiology Nuclear policy Risk Assessment Genetics
  1. Observed human data show a clear dose-rate effect: acute high doses increase cancer around 100–300 mSv, while chronic exposures below about 20 mSv/day have not reliably produced cancer even at cumulative doses above 100,000 mSv, which contradicts a simple LNT prediction.
  2. Per unit energy absorbed, radiation produces similar numbers of double strand breaks because damage mainly comes from ROS, but alpha particles deposit energy very locally, creating clustered DSBs that are much more likely to misrepair and cause cancer, so alpha exposures are a strong test of dose–response.
  3. Cancer risk depends on misrepair of closely spaced DSBs and on DNA repair dynamics, so linear damage plus proportional repair does not imply a linear dose–response; models and regulation need to account for dose rate and spatial clustering rather than relying solely on cumulative dose.

The Waiting Game: Past, Present and Future of Indian Genomics

Razib Khan's Unsupervised Learning • 343 implied HN points • 11 Dec 25
🔬 Science Genomics Biology Anthropology Cultural Studies History
  1. India has a rich and diverse history, being central to many cultural developments, including the spread of Buddhism and the evolution of various languages and religions. This diversity is reflected in its population, languages, and traditions.
  2. Genomic studies reveal that the people of India have complex genetic backgrounds, including influences from ancient populations and migrations over thousands of years, showcasing both indigenous roots and connections to other global regions.
  3. Despite advancements in genomics in other parts of the world, India has seen limited progress in retrieving ancient DNA, which hinders deeper understanding of its historical populations and transformations.

The cave where it happened: Denisova cavern’s congress of ancient peoples

Razib Khan's Unsupervised Learning • 434 implied HN points • 27 Nov 25
🔬 Science Genetics Evolution Paleontology Anthropology Archaeology
  1. A new Denisovan genome has been sequenced, revealing more about the interactions between Denisovans, Neanderthals, and modern humans. This helps us understand how different human lineages mixed together in the past.
  2. Denisova Cave is a rich source of ancient human DNA, providing valuable insights into human evolution. Both Denisovans and Neanderthals lived and interacted in this cave, leading to mixes in their genetic make-up.
  3. The discovery of Denisova 25, an even older Denisovan genome, allows scientists to trace back our shared ancestry further. It shows that ancient humans had many connections and interbred with different groups over time.

🚀 After we get to Mars, then what?

Faster, Please! • 365 implied HN points • 16 Dec 25
🔬 Science Space Astrobiology Planetary Science Space Policy Science Policy
  1. Looking for life on Mars should be the top priority, with everything else coming second.
  2. Human settlement off-planet is about more than nationalist rivalry, mining, or narrow science; it’s about taking permanent root beyond Earth.
  3. Many space supporters frame off-world settlement as part of a pro-growth, progress-oriented vision that values expansion, technology, and long-term abundance.

From 'Neurons to Nations': How Nationalism Feels So Real

Brain Pizza • 463 implied HN points • 23 Nov 25
🔬 Science Neuroscience Psychology Cognitive Science Political Psychology
  1. Nationalism is a deep psychological attachment to one’s nation that feels real and powerful, not just an abstract idea in history or politics books.
  2. National identity is framed as a neurocognitive project—brain processes shape how people perceive borders, belong, and experience nationhood.
  3. Studying nationalism with neuroscience and psychology helps explain why national feelings are vivid, emotional, and motivating in everyday life.

The Pet Theory Economy

Nepetalactone Newsletter • 1965 implied HN points • 28 Jan 24
🔬 Science Genomics Virology Health Policy Scientific Debate
  1. In the Pet Theory Economy, people defend and promote their theories as if their livelihoods depend on it, driven by the need for traffic and novelty.
  2. Challenging someone's theory is seen as interference with their ability to make a living, leading to a circular logic where blame is shifted.
  3. Focusing on various aspects of issues is valid; one should not be limited to a single perspective or group and should question narratives that feed into a narrow Pet Theory economy.

Camouflage for nests, "nests" for language survival, & tumour hijacking strategies

The Strategy Toolkit • 17 implied HN points • 23 Feb 26
🔬 Science Ecology Evolution Animal Behavior Linguistics Conservation
  1. Elaborately draped nest decorations like hanging streamers dramatically lower predation by creating a false shape that confuses visually hunting predators.
  2. This disruptive camouflage works mainly against birds and other visual predators but won’t stop mammals or reptiles that rely on smell, and placing nests over water helps reduce scent-based detection.
  3. Building tails on nests seems to be an evolved adaptation to visual exposure, using conspicuous decorations not to hide but to mislead predators and protect the nest.

Scientists Say

Doomberg • 6757 implied HN points • 16 Oct 24
🔬 Science Climate change Meteorology Environmental Science Public Trust Scientific Integrity
  1. Predictions for the hurricane season this year were very alarming, with many experts expecting a lot of severe storms. But as the season progressed, there were fewer storms than anticipated.
  2. When hurricanes did occur, some were extremely powerful, but overall, the lack of activity puzzled scientists and led to discussions about climate change's role in future storm patterns.
  3. Trust in scientists and experts has declined, as many people feel unsure about their predictions and analyses, highlighting a disconnect between scientific findings and public perception.

How Valuable Are Building Methods That Use Fewer Materials?

Construction Physics • 13779 implied HN points • 06 Feb 24
🔬 Science Construction Materials Efficiency Engineering Architecture
  1. Reducing the amount of materials in construction can significantly cut costs.
  2. Structural elements must be designed to resist axial, shear, and bending forces.
  3. Challenges exist in further reducing materials in buildings due to practical constraints, cost considerations, and performance tradeoffs.

Antiquity’s miracle skin whitening method: migrate to Sweden, wait millennia

Razib Khan's Unsupervised Learning • 303 implied HN points • 15 Dec 25
🔬 Science Genetics Anthropology History Evolution
  1. Human skin color has been important in history for understanding identity and race. People have long used skin color to categorize and identify different groups.
  2. Skin color variation is influenced by genetics and environment, with darker skin being favored in sunny areas and lighter skin in regions with less sunlight. This was shaped by both evolution and preferences in mate selection.
  3. Recent advancements in genetic research have improved our understanding of pigmentation. Scientists can now predict traits like skin color more accurately using ancient DNA, though challenges remain with degraded samples.

Perils of Flawed Meta-Analytic Methodology

The Shores of Academia • 39 implied HN points • 03 Oct 24
🔬 Science Health Research Statistics Psychology Methodology
  1. Flawed meta-analysis can mix different studies that aren't similar, making it hard to draw clear conclusions about their effects on things like mental health.
  2. It’s important for researchers to look at specific impacts and not just assume that a random-effects model explains everything. Understanding the differences in outcomes can lead to better insights.
  3. Proper analysis in studies is really important, especially when people's health is at risk. Ignoring negative findings can mislead people about the safety of products like drugs.

Some Unintuitive Properties Of Polygenic Disorders

Astral Codex Ten • 14247 implied HN points • 24 Jan 24
🔬 Science Genetics Simulation Heritability
  1. Schizophrenia, considered 80% genetic, shows varied risk in identical twins, proving genetics' complex role.
  2. Nazi eugenics program didn't reduce schizophrenia rates in Germany, showcasing environmental influences.
  3. Simplistic simulations demonstrate the nuanced interplay between genetic and environmental factors in polygenic disorders.

Peer Review 2027

Never Met a Science • 122 implied HN points • 26 Jan 26
🔬 Science Academic Publishing Peer Review Artificial Intelligence Metascience Research Policy
  1. Forbidding researchers from using LLMs is unstable and impractical because detection is unreliable and incentives to defect are strong, so allow and encourage AI use for concrete, practical research tasks.
  2. Peer review must be strengthened: shift resources toward human evaluation so people remain responsible for judgement and "taste," with reviewers held to different standards and supported by tools (including LLMs for checks).
  3. Institutional reforms and data are needed to manage higher submission volumes: introduce frictions like submission fees or caps where appropriate and build metascientific data streams to monitor uptake and adapt policies.

Peer Review of Microaggression Scholarship is an Unmitigated Disaster

Unsafe Science • 79 implied HN points • 02 Feb 26
🔬 Science Social Science Research Methods Statistics Peer Review Academic Publishing Psychology
  1. Many microaggression studies rely on correlational, nonexperimental data but still claim causal relationships between racism, microaggressions, and outcomes.
  2. Concluding that microaggressions cause negative health or mental-health impacts from simple correlations is not justified without stronger causal evidence.
  3. Peer review has often failed to catch these methodological flaws, allowing unsupported causal claims to persist in the literature.

Why Engineer Biology?

Niko McCarty • 39 implied HN points • 10 Sep 24
🔬 Science Biotechnology Genetics Molecular Biology Environmental Science Health Science
  1. Cells can help solve big problems like hunger and climate change by using chemistry and physics to rearrange atoms into useful materials. They are like natural tools that can be engineered to do tasks we need.
  2. Engineering biology has a successful history, like when Norman Borlaug improved wheat crops in Mexico. These achievements show that one innovative solution can make a huge difference over time.
  3. Now is a great time to work in biotechnology because tools for studying and changing genes are getting cheaper and easier to use. This means more people, from different backgrounds, can contribute to solving biological challenges.

Solid State Nanopores - Cambridge Nucleomics!

ASeq Newsletter • 7 implied HN points • 12 Mar 26
🔬 Science Biotech Genomics Diagnostics Bioengineering Sensors
  1. A Cambridge-based solid-state nanopore company founded around 2021 recently closed a $736K seed round.
  2. Their method hybridizes barcodes with bulky loops to RNA or DNA and threads them through a solid-state nanopore. Varying the loop patterns or spacing creates distinct labels that can be counted.
  3. They’re targeting clinical counting applications such as point-of-care sepsis tests, early cancer detection, and minimal residual disease monitoring.

What Makes an Experiment Beautiful?

Asimov Press • 522 implied HN points • 10 Nov 25
🔬 Science Biology Chemistry Physics Experimental Design
  1. A beautiful experiment is efficient and clever, showing that you can get more useful information from it than the effort put in. This idea is not just about being smart; it's also about designing experiments that yield significant results.
  2. The qualities that make an experiment beautiful include clarity, simplicity, and decisiveness. A good experiment should be easy to understand and should clearly show the results or answers it seeks.
  3. Historically, the appreciation of experiments has shifted. In the past, the focus was on revealing nature's beauty, but now it's more about the design and ingenuity behind the experiment itself.

Statistical Methods Links,12/07/2025

In My Tribe • 288 implied HN points • 07 Dec 25
🔬 Science Psychology Statistics Fertility Social media Correlations
  1. Certain personality traits like being assertive and energetic can lead to higher earnings, while traits like being anxious or preferring routine work are linked to lower earnings.
  2. A small correlation in data, such as between social media use and depression, can significantly impact outcomes, but it's important to analyze data correctly and not rely solely on models.
  3. Current fertility rates among older Millennials appear similar to older generations, but the context matters; using outdated comparisons can be misleading, and true trends show a decline in fertility.

4.3 Actions at a Distance: Fluids or Fields?

Fields & Energy • 259 implied HN points • 10 Jul 24
🔬 Science Physics Electricity Technology Engineering Energy
  1. Electricity can't really be thought of as a fluid. It has unique properties that can't be explained by the fluid model, especially in AC systems.
  2. Capacitors and inductors operate using electric and magnetic fields rather than fluids. This makes it easier to understand how they work.
  3. Transformers also rely on these fields. Their functionality shows that electric effects can occur at a distance, which a fluid model fails to explain.

Who Does Polygenic Selection Help?

Astral Codex Ten • 11562 implied HN points • 23 Feb 24
🔬 Science Genetics Medical Ethics Biology IVF Healthcare
  1. Polygenic selection can help prevent genetic diseases like schizophrenia by choosing embryos with lower risk during IVF, leading to healthier children
  2. Despite the complex nature of genetic selection, it can have positive effects on individuals and society by preventing diseases and improving overall health outcomes
  3. Analogies like preventing fetal alcohol syndrome through prenatal care or choosing healthier IVF embryos demonstrate the ethical and practical benefits of polygenic selection

Collective Intelligence and Emergence

Solve Cancer in 365 days • 59 implied HN points • 30 Aug 24
🔬 Science Biology Medicine Technology Research Collective Intelligence Emergence
  1. Collective intelligence in biology means that groups of cells work together to solve problems that individuals can't. Each level of organization, like cells and organs, solves specific issues that contribute to the whole.
  2. Emergence happens when the combined actions of simpler parts create complex behaviors. This can be seen in things like how cells coordinate to form organs or how flocks of birds move together.
  3. Understanding collective behaviors in cells could lead to big advancements in medicine. This includes helping treat cancer by changing how cells behave or improving tissue engineering and organ regeneration.

Sweet Child O' Mine

Secretum Secretorum • 378 implied HN points • 19 Nov 25
🔬 Science Evolution Biology Psychology Anthropology Cultural Studies
  1. Domestication changes animals in ways that seem unrelated at first, like making dogs friendlier and changing their ears. This happens because evolution tinkers with what it already has rather than starting from scratch.
  2. Humans show traits similar to young animals, like being playful and social. This neoteny means we've kept some child-like features as adults, which helped us bond and learn better.
  3. Humans succeeded while Neanderthals didn't because we were better at sharing ideas and learning from each other. Our culture helped us become smarter, not just as individuals, but as a group.

The Power of Limit Thinking

Asimov Press • 515 implied HN points • 06 Nov 25
🔬 Science Engineering Biology Physics Information Theory Mathematics
  1. Limit Thinking helps us figure out the best possible performance of a system. It focuses on the essential features and gives a clear measure of efficiency.
  2. This way of thinking has driven major improvements in technology, like in engines and information theory, by establishing concrete limits to what can be achieved.
  3. In biology, applying Limit Thinking can lead to new discoveries by helping scientists understand the fundamental processes, even in complex systems.

4.2.1 Ancient Views

Fields & Energy • 319 implied HN points • 26 Jun 24
🔬 Science Physics History Electricity Magnetism
  1. Ancient civilizations had early insights about magnets and electricity. For example, Thales discovered static electricity from amber and believed magnets had a 'soul' because they moved metal.
  2. The compass became crucial for navigation by the sixteenth century. Mariners relied on it heavily, and misdirecting a ship was seriously punished, reflecting the compass's importance.
  3. William Gilbert made significant contributions to the understanding of magnetism and electricity. He proposed that the Earth is like a giant magnet and identified various materials that produce electric effects.

A Problem of Prophesy

David Friedman’s Substack • 260 implied HN points • 20 Dec 25
🔬 Science Demography Population Fertility Mortality Reproduction Statistics Forecasting
  1. Total fertility rate (TFR) is a snapshot-based prediction that can underestimate the number of children women will actually have if they postpone births, while completed fertility rate (CFR) is what determines population change.
  2. There is a biological limit to how late people can have children, so shifting births to older ages can only go so far, though advances in reproductive technology could change that limit.
  3. Life expectancy at birth (an estimated measure) is also a prophecy and can fall during temporary mortality shocks even though completed life expectancy will likely be higher if mortality rates continue to decline.

The UFO craze was created by government nepotism and incompetent journalism

The Intrinsic Perspective • 18042 implied HN points • 09 Jun 23
🔬 Science UFOs Journalism Government Conspiracy Theories Media
  1. Conspiracy theories thrive in today's society due to declining trust in traditional institutions.
  2. Journalists promoting fake conspiracy theories for clicks diminishes overall skepticism and credibility.
  3. The UFO craze is influenced by government funding, key figures like Harry Reid, and media sensationalism, rather than substantial evidence.

Beyond the ISS

Chris’s Substack • 19 implied HN points • 11 Oct 24
🔬 Science Manufacturing Technology Commercialization
  1. The International Space Station (ISS) is important for research in space, especially for understanding how different conditions affect materials.
  2. There is a high demand for time on the ISS, which is leading to the development of commercial space stations to help meet that need and lower costs.
  3. Space manufacturing has been proven possible, but we need to make the processes cheaper and easier to implement in space to fully take advantage of it.

Try The 2025 ACX/Metaculus Forecasting Contest

Astral Codex Ten • 3854 implied HN points • 20 Jan 25
🔬 Science Forecasting Predictions Technology Research Competition
  1. The 2025 ACX/Metaculus Forecasting Contest is now open for predictions. It's a great opportunity for anyone interested to share their forecasts on various topics.
  2. This year, there are new forecasting bots participating, and it'll be exciting to see how they compare to top human forecasters. The contest wants to explore how well these bots can predict outcomes.
  3. The questions this year are designed to be interesting and relevant, so many people can take part. The contest aims to engage everyone's thoughts on important issues.

4.2.2 Fluid Theories of Electricity

Fields & Energy • 259 implied HN points • 03 Jul 24
🔬 Science Electricity Physics History Technology Chemistry
  1. Electricity was thought to behave like a fluid that could flow through conductors, which helped scientists understand how it could be transmitted over distances.
  2. Benjamin Franklin proposed a one-fluid theory of electricity, categorizing electricity into 'positive' and 'negative' charges, which laid the groundwork for future electrical theories.
  3. Alessandro Volta created the first battery, making it possible to study electricity as a continuous flow, leading to advancements in electrical science and technology.

I Know That I Know Nothing

Fields & Energy • 339 implied HN points • 17 Jun 24
🔬 Science Physics Philosophy Research Education
  1. Admitting you don't know something is important for growth. It helps you start fresh and build better understanding.
  2. Real science often challenges the current beliefs. Great discoveries come when people realize the accepted ideas might be wrong.
  3. Being open to being wrong can lead to better learning. It's key for scientists to question what they think they know.

No, intelligence is not like height

The Infinitesimal • 62 HN points • 26 Aug 24
🔬 Science Genetics Psychology Intelligence Heritability
  1. Intelligence is not predicted by genetics in the same way height is. Studies show genetics only account for a small part of IQ scores compared to height.
  2. IQ is more influenced by environmental factors and cultural background. This means the way we measure intelligence might be impacted by things like access to education.
  3. The meaning of IQ and what it actually measures is still not clear. Unlike height, which is easy to measure, intelligence testing doesn’t have a simple or consistent method of measurement.

Death Comes to the Beach

Street Smart Naturalist: Explorations of the Urban Kind • 359 implied HN points • 13 Jun 24
🔬 Science Marine Biology Natural History Ecology Wildlife Conservation Bioethics
  1. A small bird was saved from a drainage pipe, showcasing the joy of saving wildlife. It’s a reminder that nature can surprise us and that we can make a difference.
  2. Opalescent squid lay their eggs in clusters that wash ashore, but most will die out of water. This highlights the fragility of marine life and how conditions affect their survival.
  3. Pelagic gooseneck barnacles live on floats in the ocean but end up on shore after they die. Their life cycle shows the interesting connections between different marine creatures and their environments.

On the greats and mathematical style

Infinitely More • 15 implied HN points • 22 Feb 26
🔬 Science Mathematics History Philosophy Research Collaboration Education
  1. Greatness in mathematics is hard to rank because insights can come from many people and eras, and being the first often involves luck since ideas are sometimes "in the air."
  2. Simple, clear, easy-to-understand arguments are especially valued because they are easier to check and to learn from, and playful thought experiments or metaphors help visualize problems and reveal strategies.
  3. There are different successful working styles—long solitary grinds on one problem versus collaborative, social approaches that switch problems—and many practitioners pursue mathematics for the love of the subject rather than for prizes, with online collaboration regularly sparking new work.