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Can Humans Survive on Water Vapor Alone?

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The world is full of water, flushing down our toilets and flowing from our taps. And yet where I live, in the American Southwest, and quite possibly where you live, the kind of water people need to survive is getting harder to come by. Across the region, temperatures are rising and droughts are getting more […]

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This Galactic Collision Shaped the History of the Milky Way

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As the Milky Way was growing, taking shape, and minding its own business around 10 billion years ago, it suffered a massive head-on collision with another, smaller galaxy. That cosmic cataclysm changed the Milky Way’s structure forever, shaping the thick spirals that spin out from the supermassive black hole at the galaxy’s core. Two new […]

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How Engineering Earth’s Climate Could Seriously Imperil Life

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Travel with me to the year 2100. Despite our best efforts, climate change continues to threaten humanity. Drought, superstorms, flooded coastal cities. Desperate to stop the warming, scientists deploy planes to spray sulfur dioxide in the stratosphere, where it converts into a sulfate aerosol, which reflects sunlight. Thus the planet cools because, yes, chemtrails. It’s […]

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Job Alert: How Would You Like to Babysit Robots?

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Book a night at LAX’s Residence Inn and you may be fortunate enough to meet an employee named Wally. His gig is relatively pedestrian—bring you room service, navigate around the hotel's clientele in the lobby and halls—but Wally’s life is far more difficult than it seems. If you put a tray out in front of […]

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Secret Link Uncovered Between Pure Math and Physics

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Mathematics is full of weird number systems that most people have never heard of and would have trouble even conceptualizing. But rational numbers are familiar. They’re the counting numbers and the fractions—all the numbers you’ve known since elementary school. But in mathematics, the simplest things are often the hardest to understand. They’re simple like a […]

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Trump Hasn't Signed a Space Force Into Being—Yet

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After months of teasing a new military arm devoted to extra-stratospheric security, President Donald Trump publicly ordered the Department of Defense and the Pentagon to immediately begin establishing a Space Force as the sixth branch of the armed forces on Monday. Well, maybe. The president’s statement was not accompanied by any written directive or executive […]

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How Dark Matter Physicists Score Deals on Liquid Xenon

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If you want to build and run a $70 million dark matter detector, you're going to have a hefty shopping list. You'll need to buy hundreds of photomultiplier tubes, set up elaborate electronics, and pay graduate students, for starters. And 20 percent of your cash is going to go to just one thing: xenon gas. […]

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How Fast Do Spacecraft Travel in The Expanse?

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Maybe you thought my previous post on the crushing g-force of the Epstein drive from The Expanse would be the end of that. Wrong. This is such great clip, I have to do more. In case you missed it, let me tell you what's going on. This guy has a spaceship near Mars (maybe in […]