A veces pienso en un argumento antrópico inverso: si estoy vivo precisamente ahora y no en cualquier momento del pasado o el futuro, es porque ahora era el momento más probable para nacer. Es decir, que es en este tiempo cuando hay más humanos de los que nacer. Por tanto, en un futuro relativamente cercano (poned entre 100 y 1000 años, aunque la cuenta se puede afinar) habrá bastantes menos. El motivo de esto se deja como ejercicio para el lector.
@brucknerite estos razonamientos del _juicio final_, incluyendo los artículos mencionados en el hilo, se parecen mucho a los de la idea de que vivimos en una simulación. Todas estas ideas usan alguna variante del concepto de _observador típico_ El problema es que ninguno de nosotros es un observador típico, para serlo, hoy por hoy deberíamos estar en un área rural de la India o China. Sin embargo aquí estamos, en Europa, América o incluso alguna isla del Atlántico y con educación superior y ...
@brucknerite nada impide que Moon Watcher hubiera razonado igual. Se están empleando razonamientos estadísticos que creo no son aplicables: nuestra experiencia es nuestra, es única, no puedes hacer estadística con un punto. En principio podrías tratar de imaginar cómo sería el humano típico, pero como aún no tenemos todos los datos hay que crear un modelo para el futuro; ahora, si tu modelo de futuro parte de pensar que este momento es típico, ya estás incluyendo el resultado en tu hipótesis...
@RGBes Exacto, y «huelen mal» también, quizá por el mismo motivo. Aunque ahora mismo no veo claro del todo cómo el hecho de no ser un observador típico (aunque tampoco improbablemente atípico, no somos Amancio ni Elon) cambia las cosas en este caso. Nada impide, en principio, que un observador que viva en las afueras de Mumbai ahora mismo razone igual…
Danish astronomer Ole Rømer was born #OTD in 1644. His observations of Jovian moons confirmed light propagates at finite speed. This profound conceptual shift opened the door for work by Huygens, Fresnel, and Maxwell.
The speed of light is, to the best of our knowledge, the upper limit on the speed with which any causal influence can propagate in Nature.
Looking at the stars, we are not seeing things as they are. Even looking at a person standing in front of you, there is a short delay between light leaving them and reaching your eye.
We see everything as it was and nothing as it is. Every story the Universe tells is a history.
@mcnees this might be a naive question, but intuitively wouldn't we expect to observe a difference in transit time when Earth was moving away from Jupiter vs towards Jupiter? In other words, when Earth is on the left vs the right in the diagram? I'd expect the observed transit time when Earth is on the top vs bottom to be similar to each other.
A big thank you and shout out to the team at @Castopod for migrating my podcast from self-hosted to Castopod.com. Seamless transition and the RSS feed didn’t even change!
Now imagine Paul Kafasis, founder of Rogue Amoeba, reading this story in this interview, discovering after 18 years that everything was played out behind his back. 😱 He had no idea what had happened then!
An American entrepreneur learns 18 years later that he escaped bankruptcy from a French magazine! 👆️ Behind this slightly exaggerated and clickbait title unfolds a thread with a preposterous twist, a twist that I witnessed… 🧵
18 years ago, access to online music gave you no real choice… It was either Charybdis or Scylla, piracy or DRM. Quick reminder, DRM are as useless as a paper pan: it's like protecting a safe with a code whose combination would be written with lemon juice on a piece of paper stuck to that safe… 🙃 But that's not the point.
From what I’ve seen so far, contaminated formula caused two confirmed deaths and several more are suspected.
My nephew’s son is getting formula because of some problems that he had with mother’s milk. I definitely support the FDA improving its inspection process and putting the companies on blast for their penny pinching slipshod production processes.
If there is one physics formula everyone knows, it's E = mc².
Einstein proposed the famous equivalence between energy and mass in his second special relativity manuscript, which he submitted to Annalen der Physik #OTD in 1905.
Anyway, of all the important results Einstein published in his "miracle year" of 1905, the astounding and unexpected equivalence between mass and energy is the one that lodged itself in the popular consciousness.
Albert Einstein introduced special relativity in the paper "On The Electrodynamics Of Moving Bodies," published #OTD in 1905 in the journal Annalen der Physik.
@drewolbrich If I was made of sound waves? It would depend on the direction of the other sound wave.
As a sound wave my speed is fixed by the properties of the medium. So I'm moving at basically 340 m/s through air in some direction. Any other sound wave is, as well. But this is with respect to the medium; it provides a fixed reference frame to refer to. If the other wave is moving in the same direction as me, I'd say its speed relative to me is zero. If the opposite direction? ~680 m/s.
But I'm wondering, what if "made out of sound waves" is interpreted in the most literal way?
To perform all my measurements, imagine I'm using sound clocks, analogous to photon clocks. Also, all atoms are constructed from sound waves and behave like tiny sound clocks.
I'm also assuming that the mechanics of this sound-atom world require the sound atoms to length contract in the direction of motion relative to the medium.
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(It’s really funny to read the excuses in the replies that people come up with. „It was the smallest Benz!“ - Yes, but compared to other cars of that time it *was* quite big. Not huge, but still a Benz. „Family vans have always been bigger too!“ - yep. And Trucks are even bigger ;) Accept the simple truth. Cars have in general become bigger, especially wider. Parking spaces have grown with that. Cars occupy more and more space in cities and that doesn’t make a lot of sense.
Especially that they became wider is a problem, as the width of streets hasn’t grown accordingly. This is a problem I’ve noticed over the years. Cars *are* closer to me when I ride my bicycle on bike lanes that are just marked, not physically separated from car lanes.
@wowolff My neighbour has to park his shiny new car outside as its simply too big for his garage :) His anger attack when he found out was actually quite funny to watch from a safe distance :)