How Habits Actually Form
Habits form through repetition in a stable context, not through motivation. The timeline is longer than the twenty-one days everyone quotes, and missing a day costs almost nothing.
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Why Is the Ocean Salty?
Rivers carry dissolved minerals into the sea, and evaporation leaves the salt behind. The reason the ocean is not getting saltier is that just as much salt is being removed.
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What Is Comparative Advantage?
A country can gain from trade even when it is worse at making everything. The reason is that what matters is not who is best, but what each side gives up.
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How Photosynthesis Works
Plants build themselves out of air. Photosynthesis uses light energy to split water and attach the hydrogen to carbon dioxide, producing sugar and releasing oxygen as the leftovers.
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What Is DNA, Simply Explained
DNA is a long molecule that stores instructions as a four-letter code. The code is copied when cells divide and read out in pieces when a cell needs to build something.
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How the Internet Actually Works
The internet is not a thing owned by anyone. It is thousands of separate networks that agreed to speak the same protocol, passing your data along in small packets that each find their own way.
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What Happens Inside a Black Hole
Crossing the event horizon is not like hitting a surface. The honest answer about the interior is that our current physics stops working there, and that is the interesting part.
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What Causes the Seasons?
Seasons are not caused by how far Earth is from the sun. They are caused by a 23.4 degree tilt that changes both how directly sunlight arrives and how long it stays.
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How Writing Was Invented
Writing did not begin with literature or ideas. The earliest tablets are accounts: grain, beer, livestock. It took many centuries before anyone wrote down a story.
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The Largest Catalogue of Hydrogen Galaxies Yet Released
A new data release catalogues 156,000 galaxies by their cold hydrogen, roughly five times the previous record, and measures the local universe’s hydrogen density to 0.6 percent.