Nouvelle étude sur l'iPhone et la natalité américaine. Design : l'exclusivité AT&T (2007–2011) crée un quasi-expérimental naturel. Les comtés couverts par AT&T 3G ont eu accès à l'iPhone, les autres non. Résultat : l'iPhone explique 33 à 52% de la baisse du taux de fécondité américain sur 2007–2011. Effet concentré chez les 15–24 ans (−4,5% à −8%).
Mécanisme documenté : moins de socialisation en face-à-face, moins de rapports sexuels, explosion de la consommation de porno après 2007.
Les auteurs en tirent une conclusion inconfortable : les politiques classiques (transferts cash, crédits d'impôt, garde d'enfants) n'adressent pas ce canal.
Papier ici : https://t.co/MTwAEgGhpL
@philarekt The best play is to buy some good stuff, have a solid thesis, and forget it completely, up or down, as long the thesis holds. Nothing beat this strategy for me.
There are 'two Trumps': one who talked peace, one who talks war. And in crypto, the 'other' Trump said this about crypto: https://t.co/4PzxwQsuaH
Was he predicting the crisis coming under his own tenure? What would happen if crypto exchanges froze? 😅
@BitcoinRachy There are way too many bulls still, you can clearly see the level of stupidity of the sheeple on the prediction markets. Dumb money only at this point.
If people are worried about Bitcoin crashing to $60,000, just wait until the news gets out that Saylor will be forced to liquidate 81,000 BTC to cover Strategy’s liabilities.
The bear market is still in early stages. We are still dangerously overvalued. Remember, this market is all propped up on fake demand. It will all come crashing down much faster than it went up.
@GazzettaFerrari Ferraris aren't meant to be used as a means of transportation. They are pure status. Therefore this (not even impressive) electric car is pure nonsense.
@anishmoonka Even if they gave $1m per worker as bonus, it would have been barely a third of the company's profits. The risk though is that many would retire the next day, lol.
A Norwegian neuroscientist spent 20 years proving that the act of writing by hand changes the human brain in ways typing physically cannot, and almost nobody outside her field has read the paper.
Her name is Audrey van der Meer.
She runs a brain research lab in Trondheim, and the paper that closed the argument was published in 2024 in a journal called Frontiers in Psychology. The finding is brutal enough that it should have changed every classroom on Earth.
The experiment was simple. She recruited 36 university students and put each one in a cap with 256 sensors pressed against their scalp to record brain activity. Words flashed on a screen one at a time.
Sometimes the students wrote the word by hand on a touchscreen using a digital pen, and sometimes they typed the same word on a keyboard. Every neural response was recorded for the full five seconds the word stayed on screen.
Then her team looked at the part of the data most researchers had ignored for years, which is how different parts of the brain were communicating with each other during the task.
When the students wrote by hand, the brain lit up everywhere at once.
The regions responsible for memory, sensory integration, and the encoding of new information were all firing together in a coordinated pattern that spread across the entire cortex. The whole network was awake and connected.
When the same students typed the same word, that pattern collapsed almost completely.
Most of the brain went quiet, and the connections between regions that had been alive seconds earlier were nowhere to be found on the EEG.
Same word, same brain, same person, and two completely different neurological events.
The reason turned out to be something nobody had really paid attention to before her work. Writing by hand is not one motion but a sequence of thousands of tiny micro-movements coordinated with your eyes in real time, where each letter is a different shape that requires the brain to solve a slightly different spatial problem.
Your fingers, wrist, vision, and the parts of your brain that track position in space are all working together to produce one letter, then the next, then the next.
Typing throws all of that away. Every key on a keyboard requires the exact same finger motion regardless of which letter you are pressing, which means the brain has almost nothing to integrate and almost no problem to solve.
Van der Meer said it plainly in her interviews.
Pressing the same key with the same finger over and over does not stimulate the brain in any meaningful way, and she pointed out something that should scare every parent who handed their kid an iPad.
Children who learn to read and write on tablets often cannot tell letters like b and d apart, because they have never physically felt with their bodies what it takes to actually produce those letters on a page.
A decade before her, two researchers at Princeton ran the same fight using a completely different method and ended up at the same answer. Pam Mueller and Daniel Oppenheimer tested 327 students across three experiments, where half took notes on laptops with the internet disabled and half took notes by hand, before testing everyone on what they actually understood from the lectures they had watched.
The handwriting group won by a wide margin on every question that required real understanding rather than surface recall.
The reason was hiding in the transcripts of what the two groups had actually written down.
The laptop students typed almost word for word, capturing more total content but processing almost none of it as they went, while the handwriting students physically could not write fast enough to transcribe a lecture in real time, which forced them to listen carefully, decide what actually mattered, and put it in their own words on the page.
That single act of choosing what to keep was the learning itself, and the keyboard had quietly skipped the choosing and skipped the learning along with it.
Two studies. Two countries. Same answer.
Handwriting makes the brain work. Typing lets it coast.
Every note you have ever typed instead of written went into your brain through a thinner pipe. Every meeting, every book highlight, every idea you captured on your phone instead of on paper was processed at half depth.
You did not forget those things because your memory is bad. You forgot them because typing never woke the part of the brain that would have made them stick.
The fix is the thing your grandmother already knew.
Pick up a pen. Write the thing down. The slower road is the faster one.
Dubai offers a fantastic lifestyle and is a wonderful place to grow a company that already resolutely left the chaotic early stage start-up level, and ideally had offices in a couple countries and can manage complexity. I'd argue that **Paris** is perhaps the best place in the world to run a very early stage startup, and that advantage quickly evaporates after the Seed round is achieved because of all sort of unnecessary bureaucracy and high taxes. Overall, nothing comes remotely close to the Bay Area, those vibes, you literally come across casually dressed billionaires at your local bakery on a daily basis, want to make you work 24/7. If I could be born a second time, I'd choose that place!