The Library of Alexandria created the first catalog of all human knowledge 2,300 years ago, and a team of fewer than 20 people just finished the modern version and made it free for the entire planet. It is called OpenAlex. The name is not an accident. The ancient library had the Pinakes, a catalog mapping every scroll, every author, every subject. When the library fell, the map of what humanity knew fell with it. For the last two decades, that map existed again, but it was locked up. Elsevier owns Scopus. Clarivate owns Web of Science. If your university could not afford the subscription, you could not see the structure of science itself. Entire countries were priced out of knowing what research existed. OpenAlex indexes 474 million scholarly works. Every author disambiguated. Every citation traced. Every institution and funder connected. It updates with roughly 50,000 new works every day. The whole thing is CC0. Not just free to search. Free to download, copy, sell, and build on. The API allows 100,000 requests a day without an account. The ancient library burned and the catalog was lost for two millennia. The new one cannot burn. Anyone can hold a copy. openalex.org

The aerobic vs anaerobic model is not wrong because it’s simple. It’s wrong because it implies a switch where there is only a continuum. Glycolysis is always active. Lactate is always produced and cleared. Mitochondria are always involved. There is no moment where the body “switches” from one system to another. What changes is the balance between glycolytic flux and mitochondrial capacity and lactate is the best real-time proxy of that balance. I proposed in 2013 a model based on substrate utilization. Now I propose an update of that model built around four metabolic states. From metabolic equilibrium at Zone 2 all the way to metabolic overload, where the central question is not what fuel you’re burning, but whether the system can sustain balance. Ultimately, the ceiling of equilibrium matters more than the ceiling of oxygen consumption. 👇 substack.com/@inigosanmillan…

I'm a software engineer with 50 years of experience. If you know how to steer an LLM properly, the frontier models are extremely good at generating code. They're weak at architecture, which is one of several reasons you want a human in the loop, but they can have a very low error rate compared to most humans. When they don't - when they generate slop - it's because you didn't know how to use the tool correctly.

Everyone in the world has to take a private vote by pressing a red or blue button. If more than 50% of people press the blue button, everyone survives. If less than 50% of people press the blue button, only people who pressed the red button survive. Which button would you press?

This Easter, I invite you to look at Jesus, consider what he said and did, and ask for yourself what I believe is the most important question you will ever answer: Did he really leave behind an empty tomb? And if he did, what does that mean for you? This video was made possible and in collaboration with my friends at @ChildlikeMedia.

Major new report on global trends in mental health, out today from Sapien Labs. Data from 2.5 million people across 85 countries. Some of the most important findings: 1) Young adults used to generally have good mental health, compared to older generations. But now, in ALL countries examined, they are doing badly compared to older generations in that country. 2) "Four key factors have emerged that together predict three quarters of this effect. These are diminished family bonds, diminished spirituality, smartphones at increasingly young age, and increasing consumption of ultra-processed food." 3) The decline of young people's mental health is "most pronounced in the wealthier and more developed countries." They note that it is in such countries that smartphones are given earliest, junk food is most heavily consumed, spirituality is most diminished, and family ties are looser and often weaker. 4) "A younger age of first smartphone ownership is associated with increased suicidal thoughts, aggression, and other problems in adulthood." 5) Here is their summary of findings on early smartphone ownership: "GenZ is the first generation to grow up with a smartphone. Among this group, the younger they acquired their first smartphone in childhood, the more likely they are to have struggles as adults. These struggles extend beyond sadness and anxiety to less discussed symptoms, such as a sense of being detached from reality, suicidal thoughts, and aggression towards others. The effects arise through disruption of sleep, increased risk of exposure to harmful online content, predators, and explicit material as well as increased probabilities of cyberbullying during crucial developmental years. Excessive time spent on smartphones also diminishes the development of social cognition that requires learned interpretation of facial expressions, body language, and group dynamics. The negative impacts are particularly sharp below age 13." The report is short, accessible, and important. Read it here: sapienlabs.org/global-mind-h…

I finished my manuscript, y'all! My first book, The Heavens Declare, is officially submitted and on its way to publication. Optimistically expecting this thing to hit shelves in November. I'll announce when it's available for pre-order. To celebrate, here's a sneak-peak at the Introduction... *** I’m known online for my apologetics work. Being raised atheist and coming to Christian faith through science as an adult made me an object of interest for many people. Science is supposed to destroy faith, not produce it! I’m living testimony that that’s not true. For the last twenty years, I’ve leveraged my story and scientific experience to help Christians maintain their faith in the face of seeming scientific obstacles. I was poised to write what I hoped would be a definitive book about scientific apologetics—until a time of seemingly unending trials upended everything. Battles with cancer, lingering depression from the loss of my first daughter, family struggles, political and cultural chaos, and the profound disorientation of the world’s response to the Covid-19 pandemic left me burned out and exhausted. What once felt urgent and inspiring now seemed like a dry intellectual exercise. I put that book aside and, for several years, focused simply on survival—regaining my health, figuring out what happens after questioning so many “givens” in life, and learning to lean on God day by day. In the midst of that darkness, a friend gave me Ruth Chou Simons’ devotional Beholding and Becoming. Drawing from 2 Corinthians 3:18—“And we all, with unveiled face, beholding the glory of the Lord, are being transformed into the same image from one degree of glory to another”—the book contends that we become what we behold. Ruth’s entries encourage “everyday worship” alongside her gorgeous watercolor artwork, which captures God’s beautiful handiwork in nature. I found it refreshing, inspiring. Reading it, I wondered: Could I do something similar? Instead of presenting my own art, could I present God’s living artwork—the universe itself, as captured vividly by technological marvels like the Hubble Space Telescope and the James Webb Space Telescope? And thus the idea for this devotional was born. God first called to me through His wondrous universe at the age of nine, long before I learned to recognize His voice. His cosmos is vast beyond imagination: hundreds of billions of galaxies, each containing hundreds of millions to trillions of stars, stretching across space that has been expanding since its explosive beginning billions of years ago. Yet amid this staggering scale, I finally realized something deeply personal is unfolding. The same heavens that reveal the laws of nature also speak the truth about the character of their Creator. I know this not as abstract theology, but as lived experience. As an astrophysicist, I’ve spent years immersed in data, equations, and observations of the heavens. The more I studied the universe—its elegant order, its finely tuned constants, its origin in a singular beginning—the more I sensed an underlying intelligence and purpose. What began as intellectual curiosity became a pathway to awe, and eventually to worship. I will never look at a nebula, a distant galaxy, or the faint glow of the cosmic microwave background without thinking of the God who spoke it all into existence. In those years of faith, I have been tested in ways I never anticipated. In seasons of profound loss and suffering, the heavens became more than objects of study; they became reminders of a sovereign God who holds not only the universe, but the broken pieces of His children’s lives, in His loving hands. This devotional is born from that journey. Across thirty reflections, I explore celestial wonders—from the shimmering auroras that dance in Earth’s magnetosphere, to the ancient light of creation still washing over us today, to the scarred yet purposeful Moon, the majestic rings of Saturn born from brokenness, the graceful galaxies evoking God’s extravagance, and beyond. Each entry weaves modern astronomy, Scripture, and occasional forays into fictional realms with relatable human concerns. The heavens declare more than bare scientific facts; they point to a sovereign, creative, redemptive God. The aurora transforms solar fury into beauty through Earth’s protective shield, reminding us of divine provision during trials. The cosmic microwave background envelops us like an eternal baptism, echoing God’s first words and His ongoing work of renewal. The Moon, barren yet vital in stabilizing life on Earth, mirrors our own calling to reflect Christ’s light into the world despite our fallen state. Saturn’s rings, forged from destruction, echo Romans 8:28—God working all things for good for those who love Him. These are not mere analogies. They are invitations to see the natural world as a testament to God’s glory (Psalm 19:1), His power (Habakkuk 3), His immanence (Psalm 139), and His redemptive love. In an age when many of us feel disconnected from natural wonder—overwhelmed by screens, noise, anxiety, or despair—this book aims to rekindle it. All you have to do is look through these pages—or, better yet, look up. The stars are still there, speaking God’s promises. My hope is that as you read these entries and gaze at the incredible images, you’ll journal your reflections and pray the accompanying Scriptures. Through this simple practice of beholding, may you experience the same quiet astonishment I felt when I first saw God in His creation. The universe is not indifferent. It is purposeful, ordered, and autographed by a God who knows you by name. He who stretched out the heavens like a curtain (Isaiah 40:22) invites you to know Him more deeply through the very creation He called good. I hope these pages stir your heart to joy, trust, and worship—the kind that endures even when the night feels long. The God of planets and moons, stars and nebulae, black holes and galaxies, is the God who draws near. Let the heavens declare His glory.

How to quantify the training load of higher intensities and sprints, separately from aerobic training load, simply from power data? We suggest a 3D strain score (alternative to the "1D" TSS/TRIMP/work -> fitness paradigms) to capture the nuances of training CP, W', and Pmax.

These two African brothers run into the arms of their new parents. They had waited three long years for this moment. 😭😭 The mother showers them with kisses. The father breaks down, sobbing. Their hugs say everything: “We finally have a place to belong.” This is adoption. And yes, it changes everything. ❤️

HOW TO FIX YOUR ENTIRE LIFE IN 1 DAY