pde's

Isaac Newton assumed an inverse square law for gravitation and considered two incompressible perfect spheres with nothing else in the universe. This allowed him to compute the orbits of the planets to tolerable precision. Deviations from these predictions taught us new things: unexpected changes in the orbit of Uranus led to the discovery of Neptune, the anomalous precession of the perihelion of Mercury’s orbit became one of the major proofs of general relativity. We now have far more sophisticated models of gravity than Newton’s, and are working on refining them further.

But you can also tell this story another way. Newtonian orbits gave rise to the idea of a clockwork universe, which turned out to be deeply misleading. In the actual solar system, tidal forces and the influence of other planets on orbits mean that orbits are constantly changing. The solar system does appear to be reasonably stable, but for an entirely different reason than the one suggested by the simplified two-body problem. The adoption of important ideas was delayed due to over-rigid Newtonian thinking.

Obviously Newtonian gravity was a tremendous intellectual advance, and probably a necessary step to further progress in physics. So it is good that some people think this way. But it is also good that some people thought other ways and were willing to come out of left field with inconsistent ideas rather than working on refining existing models. Intellectual history is filled with advances that came about because someone insisted stubbornly that inconvenient observations were correct, and other advances that came about because someone had the courage and insight to ignore observations.

—  Aaron Brown
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Punta del Este, Uruguay 🇺🇾
Playa Brava 🌊
Playa Mansa 🏖
¿Cuál elegís? // Which one do you choose?
#ornelgatravelstopde #pde #puntadeleste #uruguay #beach #verano2017 #summer #playabrava #playamansa #travelblog #viaje #blogdeviaje #travelblogger #travel #blog #blogger #fblogger #fashionblogger #fashionblog #blogdemoda #view #landscape #playa #video (en Punta del Este, Uruguay)

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Please tell me you know the difference between Old English (Beowulf in its original text), Middle English (Chaucer’s works in their original text), Early Modern English (Shakespeare), and Modern/Present Day English.

There’s a huge difference, and Old English is basically a whole different language altogether. Shakespeare is not Old English.

Also Thee/Thou are not formal they’re informal. You/Your is formal.

Y'all need education.

Me harté de ti, del desorden que provocas en mi vida. Me harté de tus mentiras, de que llegues y te vayas, de que te quedes a medias, de que no estés a mi lado. Me harté de ser de ti sólo cuando tienes ganas y de contener las mías porque «estás muy confundido». Me harté de tus fantasmas, me harté de tus olvidos, me harté de un amor que sólo fue siempre mío.
—  PDE

anonymous asked:

7, 11, 12, 29, 61

What was your first dogs name?

My first me dog was Skoll. My family’s first dog was a GSD named Princess.

A breed you love, but can never see yourself having?

I’ve always been really taken by saluki but every time I seriously consider one I’m like “meeeehhhhh, naaaaahhhhh”

A breed you used to hate, but now love?

EBTs. Surprising facts you didn’t know about me: I used to drink the PDE koolaid pretty hard.

What’s your dogs favorite treat?

Anything really moist and meaty tbh. Raw stuff, that goodluvin sausage, etc.

What was the first night home with your dog like?

I mean he was mostly sleeping and I was mostly SCREAMING INTERNALLY WITH HAPPINESS.

youtube

(via https://www.youtube.com/watch?v=l3btxTMTvQM)


Numerous prescription drugs, recreational drugs, alcohol and smoking can all cause erectile dysfunction.

Diagnosis, with the help of a doctor, can identify the likely cause by taking a history, discussing symptoms, performing blood tests to establish the presence of conditions such as diabetes and heart disease, and physical examination.

Typical first-line treatment of erectile dysfunction involves the use of medications called PDE-5 inhibitors, including the well-known drug sildenafil (Viagra).