Friday, 30 November 2012

intersting facts






The Science of Mental Fitness

It’s a testament to the strength and versatility of the human brain that anyone with at least half of one tends to assume that their senses give them direct access to objective reality. The truth is less straightforward and much more likely to induce existential crises: the senses do not actually provide the brain with a multifaceted description of the outside world. All that the brain has to work with are imperfect incoming electrical impulses announcing that things are happening. It is then the job of neurons to rapidly interpret these signals as well as they can, and suggest how to react. This neurological system has done a pretty good job of modelling the world such that the ancestors of modern human beings avoided getting eaten by sabre-toothed tigers before procreating, but the human brain remains relatively easy to fool. Optical illusions, dreams, hallucinations, altered states of consciousness, and the placebo effect are just a handful of familiar cases where what the brain perceives does not correspond to whatever is actually occurring. The formation of a coherent model of the world often relies on imagined components. As it turns out, this pseudo-reality in one’s imagination can be so convincing that it can have unexpected effects on the physical body.

Nineteen Seventy Three

On 12 November 1971, in the presidential palace in the Republic of Chile, President Salvador Allende and a British theorist named Stafford Beer engaged in a highly improbable conversation. Beer was a world-renowned cybernetician and Allende was the newly elected leader of the impoverished republic. Beer, a towering middle-aged man with a long beard, sat face to face with the horn-rimmed, mustachioed, grandfatherly president and spoke at great length in the solemn palace. A translator whispered the substance of Beer's extraordinary proposition into Allende's ear. The brilliant Brit was essentially suggesting that Chile's entire economy--transportation, banking, manufacturing, mining, and more--could all be wired to feed realtime data into a central computer mainframe where specialized cybernetic software could help the country to manage resources, to detect problems before they arise, and to experiment with economic policies on a sophisticated simulator before applying them to reality. With such a pioneering system, Beer suggested, the impoverished Chile could become an exceedingly wealthy nation.
In the early 1970s the scale of Beer's proposed network was unprecedented. One of the largest computer networks of the day was a mere fifteen machines in the US, the military progenitor to the Internet known as ARPANET. Beer was suggesting a network with hundreds or thousands of endpoints. Moreover, the computational complexity of his concept eclipsed even that of the Apollo moon missions, which were still ongoing at that time. After a few hours of conversation President Allende responded to the audacious proposition: Chile must indeed become the world's first cybernetic government, for the good of the people. Work was to start straight away.
Stafford Beer practically ran across the street to share the news with his awaiting technical team, and much celebratory drinking occurred that evening. But the ambitious cybernetic network would never become fully operational if the CIA had anything to say about it.


Pushed to the Limit

On the morning of 15 September 1952, Captain James Robinson Risner sat in the cockpit of an F-86A Sabre and scrutinized the clear azure skies. He was leader of a flight of four Sabres tasked to escort F-84 Thunderjets to bomb the kimchi out of a North Korean chemical factory on the Yuan River. His squinty perseverance paid off when he spotted a flight of enemy jet fighters-- MiG-15s--making a run for his Thunderjets. CPTN Risner's opening salvo hit one MiG so hard it took the canopy off and sent the other 3 MiGs running, but Risner didn't let it end there. The injured enemy took it low, flying hard and dirty along a dry riverbed to escape. Risner and his wingman gave chase, eating the dust and rocks kicked up by the MiG's wash. Risner told "Aces in Combat":
"He was not in very good shape, but he was a great pilot - and he was fighting like a cornered rat!
He chopped the throttle and threw his speed brakes out. I coasted up, afraid that I'd overshoot him. I did a roll over the top of him, and when I came down on the other side, I was right on his wing tip. We were both at Idle with our speed brakes out, just coasting.
He looked over at me, raised his hand, and shook his fist. I thought 'This is like a movie. This can't be happening!' He had on a leather helmet and I could see the stitching in it."
The wily chase took the trio into Chinese airspace. Low altitude and high speed conspired to keep the US pilots from seeing an airfield until they were right on top of it. The MiG pilot must have radioed ahead, however, because the field's anti-aircraft guns were manned and firing.
The MiG darted, desperate to make a landing. Risner waited for his moment and hammered him with the last of his 50 CAL rounds. The MiG slammed into the tarmac and burst into flame. As they turned to hurry out of China and back into compliance with official US policy, the wingman, 1st Lieutenant Joe Logan, took a flak shell to the underside of his plane. The Sabre held together and stayed airborne, but her fuel tank was gutted, and her hydraulic fluid was bleeding out.
Bailing the crippled craft guaranteed Logan's capture, but there was no hope of making it 60 miles over anti-aircraft gun infested territory to the nearest rescue detachment. Risner couldn't desert his friend, so instead he did the only possible thing: he attempted the craziest and most daring rescue maneuver in aviation history.


Night Takes Rook

Engineers need to have faith in their designs, but not many would necessarily be confident enough to put their lives at risk just to prove it. It takes a great deal of faith to design a lighthouse for the most dangerous reef in the English Channel, especially when no-one has ever built a lighthouse on the open sea before. It takes rather more to actually build it. And one approaches the shores of hubris when one decides to visit said lighthouse with a massive gale on the way. But when Henry Winstanley, an 18th-century English eccentric, designed and constructed the world’s first open-sea lighthouse on a small and extraordinarily treacherous group of rocks fourteen miles out from Plymouth, he was so confident in his building that he blithely assured all doubters he would be willing to weather the strongest storm within its confines – a boast he had the chance to live up to when he found himself in his lighthouse as the most violent tempest in England’s history approached its shores.


The Enlightenment Guide To Winning The Lottery


Condamine/Voltaire
François-Marie Arouet knew how to get into trouble. After a very public scuffle with a nobleman nearly ended in a duel, the young playwright was exiled from Paris, the city where his plays were only just coming into fashion. He lived in dreary England for two whole years before slinking back to France, where he lived in the house of a pharmacist. There he experimented with various potions and poultices, but nothing would cure the vague sense of impotence and dread that dogged him. Finally in 1729 the gates of Paris were opened to Arouet again, but he was still ill-at-ease. At a dinner party held by the chemist Charles du Fay, Arouet, better known by his pen-name Voltaire, found the cure he had been looking for. He met a brilliant mathematician called Charles Marie De La Condamine, who promised a panacea better than any Voltaire had found at his pharmacist.
It wasn’t medicine--it was money. Condamine had a plan that would make both him and Voltaire more money than he could ever scratch together by writing plays or poems, enough money to allow Voltaire to never have to worry about money again. He would be free to live how he wanted and write what he wanted. The plan was simple. Condamine planned to outsmart luck herself. He was going to arrange to win the lottery.


Better Call Sol

The sun as seen through the SOHO Extreme ultraviolet Imaging Telescope (EIT)
On 10 January 1709, pioneering weather observer William Derham recorded an historic event outside his home near London. He examined his thermometer in the frigid morning air and jotted an entry into his meticulous meteorological log. The prior weeks had been typical for an English winter, but overnight an oppressive cold had lodged itself over the Kingdom. As far as Derham was aware, London had never experienced so few millimeters of mercury as it did that morning: -12º C. The remarkable cold lingered in Europe for weeks. Lakes, rivers, and the sea froze over, and the soil solidified a meter deep. The cold cracked open trees, crushed the life out of livestock huddling in stables, and made travel a treacherous undertaking. It was the coldest winter in the past 500 years, and one of the coldest moments in a larger global phenomenon known as the Little Ice Age. Likely causes include volcanic activity, oceanic currents, and/or reforestation due to Black-Death-induced population decline. It is nearly certain, however, that it has something to do with the unusually low number of sunspots that appeared at that time, a phenomenon referred to as the Maunder minimum.
We now know that such solar minima correlate quite closely with colder-than-normal temperatures on Earth, but science has yet to ascertain exactly why. Solar maximums, on the other hand, have historically had little noteworthy impact on the Earth apart from extra-splendid auroral displays. But thanks to our modern, electrified, interconnected society these previously innocuous events could cause catastrophic economic and social damage in the coming decades.



The Tyrant of Clipperton Island

Clipperton Island, with the freshwater lagoon visible in the center.
For a tropical island, Clipperton doesn’t have very much going for it. The tiny, ring-shaped atoll lying 1,000 kilometres off the southwest coast of Mexico is covered in hard, pointy coral and a prodigious number of nasty little crabs. The wet season from May to October brings incessant and torrential rain, and for the rest of the year the island reeks of ammonia. The Pacific Ocean batters the island from all sides, picking away at the scab of land that rises abruptly from the seabed. A few coconut palms are virtually the only thing that the island boasts in the way of vegetation. Oh, and the sea all around is full of sharks. It isn’t much of a surprise that Clipperton Island is decidedly uninhabited. This was not always the case, however. Over the course of the island’s modern history, four different nations--France, the United States, Britain, and Mexico--fought bitterly for ownership of Clipperton. It was desirable both for its strategic position and for its surface layer of guano, since the droppings of seabirds (as well as bats and seals) are prized as a fertiliser due to their high levels of nitrogen and phosphorus. Each of the four countries in turn attempted to maintain a permanent presence on Clipperton between 1858 and 1917. When a contingent of Mexican settlers did finally gain a toehold on the atoll, they were forgotten and left stranded on the island with a delusional man who seized the chance to become a dictator.

Meddle, Metal, and Mettle


Charles J Guiteau
In 1881, silk top hats and bow ties were the height of gentlemanly fashion, monocles were the preferred means of corrective vision, and the suggested greeting on newfangled telephone contraptions was a cheerful "ahoy-hoy". One June Saturday of that year, as the sweaty, swampy summer was just beginning to settle over Washington DC, a gentleman strolled into the US capital’s district jail on the banks of the Anacostia River. The visitor was well-dressed, about 40 years of age, slight of frame, and sunken of cheek. A weedy patch of gray-tinged whiskers sprouted from his chin, and his face was punctuated by a pair of dark, wide-set eyes which were predisposed to shiftiness. He was an attorney named Charles J Guiteau. He approached the attending guard at the Bastille jail and requested a tour of the facilities. Deputy Warden Russ eyeballed the man, as deputy wardens do, and explained that visitors were only allowed to tour on particular days. Undeterred, Mr Guiteau surveyed the fraction of the structure that he could see from the office, and remarked that the facility was, "a very excellent jail." The steadfast deputy warden urged the would-be sightseer to return at a more appropriate time. Mr Guiteau decided that he would do exactly that, and departed.
Although Charles Guiteau was a licensed lawyer, his visit to the Bastille was not on behalf of a soon-to-be-incarcerated client. As he would later explain, he had visited the prison to "see what kind of quarters I would have to occupy." Perhaps most importantly, he wanted to ensure that the structure would be able to withstand the angry mob that would soon pursue him. Such were the details that a gentleman must attend to when he plans to assassinate the presiden
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Thursday, 29 November 2012

Interesting Facts


Tyrannasourus rex - links to http://pubs.usgs.gov/gip/dinosaurs/ Dinosaurs
Few subjects in the natural sciences are as fascinating to the public as dinosaurs. Click on the Tyrannosaurus rex to find out answers to some interesting questions about dinosaurs.
Deserts
Approximately 1/3 of the Earth's land surface is desert. This is arid land with meager rainfall that supports only sparse vegetation and a limited population of people and animals. These arid regions are called deserts because they are dry. Some deserts are hot, and some are cold. They may be regions of sand or vast areas of rocks and gravel peppered with occasional plants. But all deserts have very little precipitation.
Mount St. Helens
The catastrophic eruption on May 18, 1980, was preceded by 2 months of intense activity that included more than 10,000 earthquakes, hundreds of small phreatic (steam-blast) explosions, and the outward growth of the volcano's entire north flank by more than 80 meters. A magnitude 5.1 earthquake struck beneath the volcano at 8:32 a.m. on May 18, setting in motion the devastating eruption.
Within seconds of the earthquake, the volcano's bulging north flank slid away in the largest landslide in recorded history, triggering a destructive, lethal lateral blast of hot gas, steam, and rock debris that swept across the landscape as fast as 1,100 kilometers per hour (about 683.1 mph). Temperatures within the blast reached as high as 300 degrees Celsius (about 572 degrees Fahrenheit).
Tsunamis
Tsunamis are large, rapidly moving ocean waves triggered by a major disturbance of the ocean floor. They are usually caused by an earthquake but sometimes can be produced by a submarine landslide or a volcanic eruption. Tsunamis are mistakenly called "tidal waves," but they have no relation to tides.
Ships at sea cannot detect a passing tsunami, nor can the waves be seen from aircraft. While passing through deep oceans, a tsunami consists of a series of waves that are only a few feet high and a hundred miles or more apart. These waves typically travel at speeds of about 600 mph. As they reach shallow water, the waves slow down but greatly increase in height, and the distance between them shrinks. When the tsunami finally strikes the coast, the waves may reach the coast at intervals of 5 to 40 minutes; the first wave is frequently not the largest. Tsunamis range from 10 to 60 feet tall.
Moon Facts
What is... Answer.
Circumference6,785 miles
Diameter2,160 miles
Surface area14,600,000 square miles
Mass81,000 trillion tons
Gravity1/6th that of the Earth
Mean distance from Earth (between centers)238,857 miles
Average orbital velocity2,287 miles per hour
Orbital distance traveled1,500,000 miles
Period of revolution and rotation27 days, 7 hr., 43min., 11.5 sec.
Temperature variationLunar "noon" (Full Moon)....243 degrees F
Lunar "midnight" (New Moon)....-279 degrees F

Efficiently Using Your Computer's Hard Drive Space

Our computers are used on a regularly basis by us, for a great many reasons. Whether it is for play or work, computers play a big role in our lives. Regardless of the things that we may do in our own lives, computers are right there to aid us. From holding our favourite music, storing our work files, saving our papers for school, there is no question that when it comes to them, we take full advantage of the storage capacity of our computers.
Every file that you create and save is stored onto your hard disk drive. Hard drives are excellent components in that they enable us to save a finite number of songs, documents, movies and various other important data onto it, but the main limitation of them is that the space is limited. It would appear that there are hard drives out there with such large storage capacities that it would take forever for you to use all of it, but sometimes, they are still not enough.
With that said there is always that option for you to search the marketplace for something a little more spacious and install that inside your computer, however, the amount of money that you may have to pay for the drive, may not warrant going through the trouble. If you find that you are running out of space on your computer, then an external hard drive may be the ideal solution for you.
The external hard drive is not only ideal for storing all your data onto it, as it's also ideal for you to use it to back up the most important files on your computer. It's possible for you to purchase external drives in a number of storage amounts, so you should take the time to find the largest drive for the money. Backing everything up to one of these drives is very beneficial, especially if your system were to crash. With your important files backed up onto the external drive, even if your system were to fail, due to a hardware fault, the information that you've stored onto the external drive would still be accessible.
External hard drives are also great in that they enable you to transfer data from one computer to another, with ease. If your someone who finds themselves in a number of different locations, on a regularly basis, then you may want to consider using an external hard drive to transfer the data that you work on from computer to computer.