Nervous System & Body
10 pieces · 42 min of reading
Why You Feel Before You Think
Your brain reacts to danger about a quarter-second before "you" get a vote. That's not a flaw. It's the feature that kept your ancestors alive.
Quick read3 min02The 90-Second Rule
An emotion is a wave, not a wall. Left alone, the physical rush of even a strong feeling runs its course in about a minute and a half. What keeps it going longer is you — feeding it with thoughts. That's oddly good news.
Quick read3 min03How to Actually Calm Down
"Just relax" is useless advice, because calm isn't a decision — it's a physical state. But you have direct, physical levers to switch it on. Here's what actually works, and why.
Quick readInteractive3 min04Sleep Is a Skill
You were taught that sleep is something that just happens to you. It isn't. It's a set of conditions you can arrange — or accidentally sabotage. Here are the levers that actually matter, ranked, so you can stop guessing.
Quick read4 min05Stress vs. Burnout
They feel similar from the outside, so people treat them the same way — and that's why the usual fixes (a weekend off, a good night's sleep) work for one and fail completely for the other. They're not the same thing. Knowing which you're in tells you what will actually help.
Quick read3 min06Pain, Explained: Why It's in Your Brain, Not Your Knee
In 1995 a builder jumped down onto a 15-centimetre nail. It went straight up through his boot, and he was in such agony that doctors had to sedate him with fentanyl and midazolam before they could pull it out. When the boot finally came off, the nail had passed cleanly between his toes. His foot didn't have a scratch on it.
Read6 min07What Exercise Actually Does to You
London's old double-decker buses had two workers each. The driver sat all day. The conductor climbed the stairs hundreds of times a shift, collecting fares. In the years after the Second World War, the epidemiologist Jerry Morris noticed that the drivers had more heart disease than the conductors did. His work, published in The Lancet in 1953, helped launch a whole field of science that keeps reaching the same conclusion: moving your body changes nearly everything inside it.
Read6 min08Dopamine Is Not the Pleasure Chemical
Your phone buzzes. Before you've even looked, something in you leans toward it. That lean is dopamine. Notice it happened before anything pleasant did, and that the message itself is often a letdown.
Read5 min09The Vagus Nerve: Real Science vs. Wellness Hype
On the night before Easter Sunday in 1921, the pharmacologist Otto Loewi woke from a dream with an idea for an experiment, scribbled it down, and fell back asleep. In the morning he couldn't read his own handwriting. The next night the dream came back, and this time he went straight to his lab.
Read5 min10Your Immune System, Day by Day
Most of what makes a flu feel awful isn't the virus. It's your defences at work. Drag through a real infection's timeline and watch who shows up when, and why the second time is so different.
Quick readInteractive4 min