Authors: Jacob N. Oppenheim, Marcelo O. Magnasco
We investigate the canonical Scheidegger Model of river network morphology for the case of convergent and divergent underlying topography, by embedding it on a cone. We find two distinct phases corresponding to few, long basins and many, short basins, respectively, separated by a singularity in number of basins, indicating a phase transition. Quantifying basin shape through Hack’s Law
gives distinct values for the exponent
, providing a method of testing our hypotheses. The generality of our model suggests implications for vascular morphology, in particular differing number and shapes of arterial and venous trees.

Live Long and Prosper
For regular readers of the New England Journal of High Energy Physics, I need no introduction. If you’re not familiar with that publication, Greetings I am Dr. Sheldon Lee Cooper B.S., M.S., M.A., Ph.D., Sc.D. I am a senior theoretical particle physicist at Caltech focusing on M-Theory or in layman's terms String Theory. I am not one who usually partakes in social networking for I seldom have a desire to do so, but I feel this blog will add great consistency to my Daily Social Interactions. I am fond of comic books, costumes, roleplaying games, video games, customizable card games, action figures, fantasy, and science fiction, specifically Battlestar Galactica, Doctor Who, Stargate, Star Trek, Star Wars, and Firefly, although I strongly dislike Babylon 5 for reasons that need no explanation whatsoever. I will leave my ask box open but does not mean I wish for you to slaughter me with your brainless inquisitions. I will record my D.S.I. at the end of each day via a "Text Post."
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Daily Social Interactions: May 24, 2012
Today is Thursday, May 24, 2012.
Hello. Today was another rather typical day at the university. I don’t have many details to convey besides the rather unusual appearance of Professor Rothman during the lunch hour, sporting nothing but his pair of boxer briefs. I am now starting to understand the decision behind his retirement. I’ve been thinking about time travel again. It occurs to me that if I ever did perfect a time machine, I would just go into the past and give it to my past self, thus eliminating the need for me to invent it in the first place. It really takes the pressure off. I took a few moments to check my calendar for upcoming events. According to the previously marked dates on my calender for future references, it is Penny’s time of the month. I notified Leonard to tread lightly. Tonight we had pizza from Giacomo’s. As always, my toppings of choice were sausages, mushrooms, and light olives. The olives really add that zingy flavor that I enjoy. Well, it seems that I have logged the main points of the day. Tomorrow, Leonard and I have to go to Whole Foods to buy groceries. After I finish making the list, I will be heading off to bed. That is all for now.

(Source: drsheldoncooperphd)
Dr. Sheldon Cooper’s Joke of the Day: May 24, 2012
A customer comes into a computer store and says, “I’m looking for a mystery Adventure Game with lots of graphics. You know, something really challenging.”
“Well,” replied the clerk, “have you tried Windows 98?”
(Source: drsheldoncooperphd)
This new composite image of M101 also known as the “Pinwheel Galaxy”, contains data from four of NASA’s telescopes in space: X-rays from Chandra (purple), Infrared from Spitzer (red), optical from Hubble (yellow) and Ultraviolet from GALEX (blue).
This interesting picture shows how different telescopes (CGRO, Chandra, COBE, HST, Spitzer, EUVE & ALMA) capture different electromagnetic radiations:
Daily Social Interactions: May 23, 2012
Today is Wednesday, May 23, 2012.
Hello followers. It’s going to be a little difficult to type this as I am being verbally assaulted by Leonard, Raj, and Penny as they are still playing Halo. I had a conflict with the vending machine today while attempting to purchase a bottle of Dasani. I inserted a crisp dollar bill and a quarter from 2008 in to the machine. The bottle unhooked from its position but then proceeded in becoming lodged between the rack and the glass pane. After shaking it 3 times and being yelled at by the nearby cafeteria worker, it finally became dislodged and I was able retrieve it. At this point, I would usually make a smart remark about this event but I just don’t have it in me at the moment. It must be my temptation to join the current Halo madness that is in progress not 10 feet away from me. We went to the comic book store today and I bought the latest Flash issue and also purchased an expansion pack for Mystic Warlords of Ka’a. After going to Soup Plantation for a rather bountiful meal of creamy tomato soup, we ended up where we stand now. It is getting pretty late, but Halo is beckoning me. Perhaps I will disregard my usual bedtime just this once. I hope you all had a splendid day. That is all for now.

(Source: drsheldoncooperphd)
Dr. Sheldon Cooper’s Joke of the Day: May 23, 2012
There are three engineers in a car; an electrical engineer, a chemical engineer and a Microsoft engineer. Suddenly the car just stops by the side of the road, and the three engineers look at each other wondering what could be wrong.
The electrical engineer suggests stripping down the electronics of the car and trying to trace where a fault might have occurred.
The chemical engineer, not knowing much about cars, suggests that maybe the fuel is becoming emulsified and getting blocked somewhere.
Then, the Microsoft engineer, not knowing much about anything, comes up with a suggestion, ’Why don’t we close all the windows, get out, get back in, open the windows again, and maybe it’ll work !?’
(Source: drsheldoncooperphd)






